HCF and LCM - Shortcuts & Tricks for Placement Tests, Job Interviews & Exams

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Crack the quantitative aptitude section of Placement Test or Job Interview at any company with shortcuts & tricks on HCF and LCM. Extremely helpful to crack entrance exams like MBA, Banking - IBPS, SBI, UPSC, SSC, Railways etc.
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www.tutorialride.com/
www.careerride.com/
#HCFAndLCM #QuantitativeAptitude #PlacementTest
0:00 Quantitative Aptitude
5:31 LCM Least Common Multiple
10:33 Quickly find LCM & HCF
25:37 What greatest number divides 17, 42 and 93 and leaves remainders 4, 3 and 15, respectively?
30:20 What least number when divided by 36, 24 and 16 leaves 11 as remainder in each case?
39:53 The ratio of two numbers is 5:6 and their LCM is 480, then their HCF is
44:31 What largest number will divide 47,35 and 27 leaving same remainder in each case? What will be the common remainder?
46:59 There are 3 equilateral triangles with sides 114 cm, 76 cm and 152 cm. What maximum size scale can measure them exactly?
52:39 5 clocks ring automatically at intervals of 12 minutes, 8 minutes, 3 minutes, 4 minutes and 10 minutes, respectively. In 8 hours from the moment they start, how many times will they ring
57:03 3 cyclists cycle along the circumference of a jungle. They complete one round in 27 minutes, 45 minutes and 63 minutes respectively. Since they start together, when will they meet again
58:46 Manoj wants to paste wallpaper on wall of his room. The wall is 4 meters and 50 cm in length and 3 meters and 50 cm in height. But the wall should be covered completely only by square pieces of wallpaper having same size. What is the number of maximum sized wallpaper squares needed to cover the walls

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1 июл 2024

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Комментарии : 1,1 тыс.

@CareerRideOfficial 5 лет назад

Practice Questions on "HCF and LCM" available at: www.careerride.com/mcq/problems-on-h-c-f-and-l-c-m-quantitative-aptitude-mcq-questions-13.aspx

@simranaggarwal7641 5 лет назад

Upload video for number system

@anushaAnu-pj7gr 5 лет назад

Thank you soo much sir

@anushaAnu-pj7gr 5 лет назад

Sir link is not opening

@DhanushaDevendala 4 года назад

Q6 was wrong check it once

@baisakhimurmu9801 4 года назад

Sir 135/5=27

@sreelakshmigopinath359 5 лет назад

Second question is wrong. Ans is 12/1350 (135/5=27 not 29)

@suniln5542 4 года назад

Ans. 24/1350

@suniln5542 4 года назад

👍

@tejasinamdar9637 4 года назад

@@suniln5542 24 can't divide 36 so 12 is right.

@sanjibmitra8124 4 года назад

my ansr also 12/1350

@BusinessVMobile 4 года назад

Help pls. Can it still be simplified to 2/225? Or should it just be 12/1350?

@paras2021 2 года назад

Friendly way of teaching just like teaching in classroom.Thank you so much sir from bottom of heart for such lovely tutorials.

@nishkaveluvali5395 3 года назад

Thank you for a great session and helping us to gain knowledge. But in second question it should be 27 as a divisor for 135, so the answer obtained is 12/ 1350.

@RanjithRanjith-yt4nh 2 года назад

12/4050

@ansaralia1701 2 года назад

correct

@shailendrakumarkusumbiwal3902 2 года назад

Yes there is a correction in final answer.

@prashantsahu6212 2 года назад

yes i also got this answer

@arpitmishra03 2 года назад

12/1350

@srivishnu5914 2 года назад

this channel was recommended by our institute really awesome videos i feel instead paying fees in my institute would have watched your videos before

@shreedharbadiger7594 3 года назад

i appreciate the hardwork you have put in this video to make the concepts clear. In second question the LCM of denominator is 1350. so that the ans is 12/1350.

@abhijeetmandal1963 3 года назад

Yeah broo

@Simham_PTN 3 года назад

Well said bro in a polite way

@independentcreativity5043 3 года назад

wah ehsaan kiye bata kar ata hai to khud karlo ek to free mein chanel bata rha hai upar se usko bhi rectify kar rhe hai

@mandarjoshi6424 2 года назад

Indeed.. litrally I tried for 2-3 times and I got the same 25*27*2 = 1350

@parvathy989 2 года назад

Yes true

@DEEPIKASMMA Год назад

The answer for question 2 is, 12/1350 because LCM = 1350 and HCF = 12.

@PHOENIX-nd3hs Год назад

Yess

@yourshit3053 Год назад

Yeah that's what made me doubt the answer

@revantheshc8185 Год назад

Exactly ☺️☺️

@saikrishna3296 Год назад

I cross checked myself thinking that I gone wrong while simplifying for 10 minutes 🤣🤣

@gudesamson9308 Год назад

He made mistake in calculating 5*27 =135 but he said 5*29=135

@osmanhussain6715 3 года назад

There were some mistakes in the exedcution but the concepts and methods dicussed were very accurate and good. Well done

@srichirps 4 года назад

Excellently explained!!! Commendable job 👏👏👏

@utkarshtripathi5110 3 года назад

best class i ever attended...of hcf and lcm

@shivharivenkatesh Год назад

Just this one playlist and all topics are thoroughly covered with variety of questions Thank you so much

@KD-xi9wu 3 года назад

51:47 When you put x= 4 to X^2-8X+15 it will never be 0.

@govardhanyadav7378 Год назад

I am really thankful for your efforts of helping students.I learnt a great deal from you,as I was struggling before finding your channel

@shivangipandey1753 Год назад

The best thing in your teaching is that you start from the very basic and then go for tricks so that the base become stronger.... thankyou so much for your efforts ❤️

@ssacademy5408 Год назад

Yes

@karteekpaila8354 Год назад

Sir you are amazing , you find awesome alternatives to cancilisation of any problem in just a minute..❣️

@vaibhavi1737 3 года назад

Thanqew for your wonderful teaching!😻 The methods, tricks are so wonderful!! But the main thing is you have a catchy voice!! Very pleasant!!!😍🎶

@lastairbender6389 3 года назад

Sir,ur teaching is very useful to us.And,in the 2nd sum,I think the lcm of 135 is 27

@deepakrevidagar4275 3 года назад

In 2nd question of finding hcf of 36/75, 48/150, 72/135 . LCM of (75, 150,135) = 1350 because all those are divisible by 15. So the answer is 12/1350.

@rambabupalla959 Год назад

12/1350

@bhuvidhana 2 месяца назад

@@rambabupalla959 please ask mee 7 question why lcm is 480

@djyashofficial7972 Месяц назад

@@bhuvidhana Bro 480 is given pls read que carefully

@divyasam37 2 года назад

Thank you so much sir..🙏for providing content which is very helpful for competitive exams and ur explanation is awesome👏 so satisfied vth ur classes sir..😊

@surajt3843 2 года назад

Sir the way you teach You make all Difficult sums so easy Thanks a lot sir

@independentcreativity5043 3 года назад

This channel is free to understand concept but still ur society is not seeing the good side still sending comments on the small multiplication mistake.For those people i would like to say "SAALE AGAR ITNI HI ATA HAI TO KHUD KAR LE"

@suranjanasaha4336 2 месяца назад

Yes I am seeing ur comment after two years but this is the fact😂 when you are doing great things noone appreciate you but if u have done a small mistake society will always criticise u

@siddu1680 4 года назад

you : 49:40 that 19th table my brain: we don't do that here

@anjalirmenon8795 3 года назад

Cant express my gratitude through mere words.....thanku so much sir

@moulyanerella 3 года назад

Enjoyed a lot by learning...thanks for this video..☺️

@hemanthpoondla 3 года назад

thank you very much sir !! this video helped me a lot

@jayrathod2172 2 года назад

If anyone wants to understand what just happened in 44:30 question no 9. suppose, the common remainder is k and HCF is x. 47 = ax + k 35 = bx + k 27 = cx + k we cant calculate HCF x of 47, 35, 27 because we don't know the remainder k so 47 - 35 = 12 = (a-b)x , 35 - 27 = 8 = (b-c)x , 27 - 47 = -20 = (c-a)x and HCF of all this 12, 8 and 20 has HCF x and it is free from remainder k

@RahulSoni-br1qd Год назад

Awesome , just awesone . Best and simplest video you're gonna find on HCF/LCM.

@AdityaShinde08 10 месяцев назад

Thankyou so much, this was my weak topic from start of my school year till date when I am in engineering and I was ashamed to admit it, but because of your videos, I have understood the topic completely and can solve its questions correctly. Thankyou Sir and CarrerRide.

@manoharstanley5602 5 лет назад

Sir very nice, need more new sums.....in each chapters....humble request

@ayushimaurya8965 3 года назад

Thankyou so much sir...I understood very well👍🏼

@muralikrishnakrishkanna523 3 года назад

Really

@Mathewjerry07 3 года назад

Great Explanation! Thankyou so much sir.

@anupwasnik1725 6 лет назад

Best channel.....this video solve my all doubts👍

@yashrajtalks 11 месяцев назад

CareerRide is my new learning platform. Great Going .. pls don't change the way of teaching. many channels cover in just 10 to 15 min which helps nothing. loved this video.. starting from basics and covered each type of question. Thanks alot

@nainayadav9956 2 года назад

The way you teach sir has developed a interest in me in studying it ....thanks a lot

@RaushanKumar-dt3pv 18 дней назад

hey can i continue with this channel for apptitude

@moviescounter7596 3 года назад

Ye mera favorite channel hai I love this channel bcz mujhe yahan se bahut kuchh sikhne mil rah hai thank you sir

@faizusultan8849 3 года назад

You are excellent.May God bless you ❤️

@nissisikinam3649 3 года назад

I absolutely enjoyed this session 😄❤️

@dasariaravindh6826 3 года назад

Thanks for covering different types of problems. It helped me a lot...Can you please explain general method for the last method coz I am getting answer different from the option verification. Again, Thanks a lot..... you are better than my Aptitude Sir.

@awesomemoney4164 3 года назад

Thank u 👍 very much sir. I found this video very helpful. Keep making such videos❤️

@nidhisharma3172 3 года назад

Ooo God.......atleast at the end someone came up with best explanatory vedio.....😊 thanks ...

@AkashKumar-oo6gs 3 года назад

Excellent Work!!!❤️ there was just Calculation error in Q2 but approach was appreciable

@xaviball2911 2 года назад

Ya, LCM of denominator is 450 right?

@bipashapal9703 5 лет назад

Every question is beautifully explained..thank u so much 😊

@CareerRideOfficial 5 лет назад

You're welcome, Bipasha! Glad that you found the content useful. Stay connected :)

@rachitbarjati Год назад

Hyyyy

@baijup139 3 года назад

Great hardwork.Thank you sir

@nikitachhabra9309 Год назад

Sir, your way of teaching is superb.

@hritikakoli5519 4 года назад

who so ever is coming across the video don't leave it because it's of 1hr 10 min i completely assure you that it will help you a lot thank you for the knowledge 🤗

@CareerRideOfficial 4 года назад

Thanks for assuring other viewers, Hritika. Appreciate it :)

@farmanwali1324 2 года назад

Thank You for your efforts, Sir. In Q3, the remainder of 93/13 is not 15 as 13 * 7 = 91 and we get the remainder as 2. I think there is a problem with the question as HCF would be 13 only when the remainders are 4, 3, 2. Please correct me if I am wrong.

@priyankataak5394 2 года назад

You are right. I think question is misprint. Remainder would be 2 not 15.

@jtubersd1052 2 года назад

Yes. Bro.. I just checked now

@LIVE_LIVELY 2 года назад

Yes question is wrongly printed

@jyotiramkamble1842 Год назад

Correct 💯😅

@ABIRAJP-dm1di 7 месяцев назад

it may be some tricky question made to confuse us

@ashishrajora5464 4 года назад

Thanks a lot sir your voice is magic and easily understand

@begumjamadar3794 4 года назад

Excellent explanation.. Sir thank you so much..

@Raja-tt4ll 5 лет назад

It was a nice video but Question 2: LCM is 1350 (75,150,135).

@NaveenSingh-js6ts 5 лет назад

Yes, Bcoz here by mistake he took 29 in place of 27. i.e. 135/5= 27.

@maddalasowgandhini1887 5 лет назад

Thiyagu yes u r correct

@dakshayanidakshi8110 5 лет назад

Yes sir it's not 29

@utkarshsinha2551 5 лет назад

Yes

@madhuranayak5734 4 года назад

Yess ua crct

@mounitadoju484 5 лет назад

your communication skill is too good.....

@Shivi966 3 года назад

Excellent videos, thank u soo much for these videos. it's really helpfull🙏🙏🙏

@THEINDIANTLM 2 года назад

your complete session is just wonderful....

@Anusha-jx1kp 5 лет назад

Thank you sirrr Please sir will you make number on system videos also it's my request

@rameshdurgam3589 4 года назад

Clarrified my doubt how to decide whether LCM or HCF Thank you sir

@cuspbanker9128 2 года назад

Awesome session, absolutely satisfying.

@munagapatikavya8045 2 года назад

Thank you sooo much sir.Gonna suggest this wonderful channel to all my peers.Keep making such videos:)

@CareerRideOfficial 2 года назад

So nice of you. Thank you!

@jagadeeshb3824 3 года назад

Definitely ur hardwork is appreciable but there is an error in question 3 solution....Please have a look

@yaichenba9917 3 года назад

Sir Q(11) is wrong . (x-4 ) is not the factor of (x2-8x+15) . so, (x-4) can't be HCF of both equations . Hope you correct it Sir.

@bimleshthakur2940 5 месяцев назад

Exactly

@OvishaSanyal 2 месяца назад

Is here the question wrong only or the method and concept are also wrong?

@AnkushRaj-bl5ye Месяц назад

@@OvishaSanyal The methodology is correct, but the question is wrong.

@simm5622 3 года назад

Beautifully explained.❤️

@ahmedgamingedits1845 Год назад

Bro you literally cleared my concepts thnks alot

@UdayKumar-so2vb 5 лет назад

At 36:35 least number to find... The differance is same value can be subtracted The differance is different what should be do

@nainigotami9543 4 года назад

Such an amazing explanation by u sir.....got it like that I'll never forget it ....thanks for ur efforts for us....👌👌

@shabditashukla2964 3 года назад

Thankuu so much sir for such an awesome video. Waiting more to come like this👌

@ameerbrave9875 5 лет назад

your videos are the reason i am able to solve aptitude questions .thank you very much keep up the good work!!!!

@CareerRideOfficial 5 лет назад

You're welcome, Ameer. Thank you for writing in. Your comments motivate us to do better. Do take a look at our Logical Reasoning videos as well. Stay connected and please subscribe for new videos :)

@amanchander7837 6 лет назад

Thank you sir these videos are very helpful and you explanation is very good !! But i have a doubt in question 11. I can be wrong so please correct me. When you put the value of x=4 in the equation they are not equal to zero. It would be correct if the equation was (x^2)-8x+16 instead of (x^2)-8x+15. And again thank you for your efforts.

@shrirajtupe7220 4 года назад

K= 15/4 No need to equate.. simply put x=4 in x^2-kx-1

@surekhagiri8023 3 года назад

But when we put 'x=4' in two equations , we get '-1' in both the equations -1=-1 . To find 'k' we equate both the equations that means both the equations has same value. So, i think for that question equation answers should be equal instead of equations equal to '0'.

@karansiriya7796 3 года назад

But hcf is also a factor.. so it should divide perfectly.. i.e. remainder = 0 ,, so why equate

@surekhagiri8023 3 года назад

@@karansiriya7796 Yes Actually ( X-4) is not HCF to those equations.. But in the question they given If (X-4) is HCF to those equations then what is K value?... So when we put X= 4 in the both equations they must get satisfied.. That means when X=4 both equations get equal value. So putting X=4 in both equations by equating we get K=4 According to question we have to find K value and they asked if X-4 is HCF then what is K value..

@karansiriya7796 3 года назад

Ohh.. ok.. I got it.. just a little mistake in video.. "equations = 0" ,, instead directly equate.. Thanks 👍

@arunsridhar6021 2 года назад

Thank you sir ! Thank you so much for teaching. Now I placed CTS company with the help of your videos and your teaching. Great job sir.

@CareerRideOfficial 2 года назад

That's a fantastic news, Arun. Congratulations. Thank you for coming back and letting us know. All the best. :)

@dharanimuthusamy3187 2 года назад

U r the best Teacher ... Thanks for making this video

@meghanamegu6404 3 года назад

I appreciate d hardwork u hv put in this video to make d concept clear ..thankuuu sooo much ❤ it helps me a lot lot lot lot plz one request can u plz teach English grammar..i doo silly mistake & go wrong with that plz think about this

@pritamsaha86 4 года назад

The explaination is really wonderful. Me just want a few things. It is not a must to find HCF when greatest is mention. We have to check whether it is written "divided by" or "divides" in the question alongwith. For example, in a question like" find the greatest no of 3 digit which when divided by 6, 9, 12 leaves 3 as remainder in each case". Here we have find the LCM of the nos. and then carry on the other steps as required. Actually I derive it after practicing few problems of HCF and LCM.

@Agl_Mansha789 2 года назад

But in all the qs discussed, where greatest no was mentioned wether along with divided or divides - HCF WAS USED....CAN U EXPLAIN...

@Agl_Mansha789 2 года назад

When will we use lcm when greatest no is mentioned...i don't understand

@Agl_Mansha789 2 года назад

@CareerRide sir can u plz explain

@VishalGupta-xw2rp Год назад

@@Agl_Mansha789 Yes although Greatest was mentioned but it's asking to find the dividend as divisiors are given. GCD will find the factor of divisor itself which will be wrong so we find LCM then add the remainder

@VishalGupta-xw2rp Год назад

@@Agl_Mansha789 So say simply if question says to find:- Divisor (Divides) - GCD/HCF Dividend (Divide by) - LCM

@varuns7074 4 года назад

I studied this video for more than 2 weeks sir. You are so awesome sir. Thank you sir and CARRER RIDE for updating this. Thankyou...

@CareerRideOfficial 4 года назад

Most welcome :). Do take the advantage of our interview videos as well.

@varuns7074 4 года назад

@@CareerRideOfficial Surely

@yusranihad2254 3 года назад

thank you so much...explanation was crisp and clear

@rettopchacko4939 4 года назад

Superb, thank so much sir, it's very useful 😍🥰😘

@Umadevi-rh3ig 5 лет назад

It is a bit clumsy. But very excellent explanation and very important problems selected

@abhishekranjan7725 5 лет назад

In question 12 we will add 1 to the answer so it will become 5 cuz we also count the bell which rang just before .

@kunaljaiswal7119 5 лет назад

Question says....from the moment they start...not the moment they rang together

@infoguys9364 2 года назад

Well this is correct

@sanjaykumar-k4964 Год назад

It's a extraordinary explanation sir,Very easy to understand

@AshwinMaloo79 Год назад

Dhanyavad Sir Ji 🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏

@virajbhalla4049 5 лет назад

Your method is wrong. Remainder can never be larger than the divisor . Ques 3 , ans is 13 but the last part (93) has remainder as 15. when 93 is divided by 13 remainder is 2 . Also in Ques 6, you derived the ans as 1461 , remainder 21 isn't possible in any case as all the divisor are smaller than the remainder. 1461 gives remainder 9,5,3,1 for divisors 12,16,18,20 respectively.

@mathsparAptitude 4 года назад

A very good observation. In that sense, both the questions (3 and 6) are wrong. Also, the solution for Q15 could have been a little more elegant. The sum of 156, when divided by 13 (the HCF) gives 12. So, essentially, we need two numbers that are co-prime (so that the HCF remains 13) and that add up to 12. The only two pairs that work are 1 and 11 and 6 and 7. This is simpler than having to work with larger 3-digit numbers and checking if their HCF is 13. Still, I must add that such mistakes do creep in at times and it should not be allowed to cloud the good work done by CareerRide or other educators.

@tarunsankuri322 4 года назад

11th question:if both the equations are equal to 0,why can't we substitute X=4 directly in eq 2

@kowshikatmakuri4193 3 года назад

The equations are not equal to 0. Both the equations will be equal to each other if 4 is substituted in them.

@11anushkariya18 Год назад

@@kowshikatmakuri4193 why??

@11anushkariya18 Год назад

I think question is wrong because if we divide x^2 - 8x + 15 by x - 4 It is not completely divisible so it is not the factor there must be mistake in equations

@udayasrireddygangappagari2990 6 лет назад

thank u sir...... such a explanation....

@airajesh3069 5 месяцев назад

Literally this is a nyc video and full of information.... nyc playlist (most wanted)

@ravindrathalari8332 4 года назад

finally, I choose the best platform to learn aptitude...Thank you for the best content

@CareerRideOfficial 4 года назад

You're welcome :)

@vigneshwaran7644 5 лет назад

39:33 how came answer would be 1461... When 1461 is divided by 12 the answer will be quotient 121 and reminder be 9

@aizad786iqbal 3 года назад

If u take one less ,i.e add 12 to 9 then it will be 21... How else a no. Like 12 can leave remainder 21??

@flower9067 3 года назад

Thank you for your great work sir

@itsartisticthing 4 года назад

It supports me alot to prepare fir campus, tq so much sir making it..keep on doing like this

@CareerRideOfficial 4 года назад

Yo're welcome, Harshita! Stay connected :)

@johnnelson3988 Год назад

For Q3, if you consider a=bq+r, then you have 17=bq1+4, 42=bq2+3, and 93=bq3+15. Clearly, bq1=13. Since 13 is a prime number, q1 must be 1. But b is also the HFC, so the answer is 13.

@indrayudhpaul6445 10 месяцев назад

But 93%13=2. In the question, it's 15 (which is again 13+2). So I am a bit confused if the question is correct or not.

@bhaveshpankhaniya3378 3 года назад

Pls explain 93 divided by 13 leaves reminder 15.🤔 Check out at minute 29:51.

@mukkidiupendhar9271 3 года назад

Yeah when 93 divided by 13 we get reaminder as 2 not 15

@Parvez098 3 года назад

93/13 reminder 15

@aizad786iqbal 3 года назад

if u think that way you won't be able to solve these questions..because to leave remainder 15 a number must be greater than 15..and less than than 17...because first number is 17..so only 16 but that will leave remainder as 1 which is not asked in question....so his answer is correct....