How to round to significant figures (s.f.) 

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Search for QUADRATIC EQUATIONS by Crunching Numbers

Best of luck with the exam tomorrow. I'm glad you found the video to be helpful.

Good luck with your test

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I'm very pleased that this video helped you and I'm glad that you are no longer confused about this topic. If you come across other areas of maths that you need help with please post a comment on my channel and I will try to create a video that will help. I am currently creating a series of Cambridge IGCSE revision videos, but the syllabus is very similar to GCSE so the videos I upload should be useful to Year 10 and Year 11 students. Best of luck with your studies and thank you for leaving such a nice comment.

Same

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I'm glad the video helped for your homework. The good thing about RU-vid maths videos is that you can rewatch them many times or pause them whilst you try the examples. Teachers can talk too fast sometimes when they have a lot to get through in the lesson. I used to do this and didn't always realise that students couldn't keep up. Good luck with your studies.

@@DavidWrightUK yes i put it on x1.25 speed because it was a little too slow for me but other then it was a really good explanation. new sub 💖

I'm pleased the video helped and wish you all the best for your test.

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I'm pleased that the video helped. RU-vid is a great place to share knowledge and I'm glad that I am able to help students understand some of the trickier topics in maths. Best of luck with your studies and thank you for such a nice comment.

I'm really pleased that the video helped. Video lessons can often be better than school.

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Thank you, now I want you to help me to find the lower and upper bound for 400

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Best of luck with the exam. I'm glad the video helped.

Significant figures can be a tricky topic. The main thing is to be careful with numbers that start with zeros.

@@DavidWrightUK Alright I'll try

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Search for QUADRATIC EQUATIONS by Crunching Numbers

Search for QUADRATIC EQUATIONS by Crunching Numbers

I'm pleased that you found the video helpful. I wish you all the best with your studies.

@@DavidWrightUK Thank you Sir.

It's great that lots of people are finding this video useful. I'm really pleased it was helpful for your homework.

Good luck. Hope it goes well.

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I try to answer the comments whenever I can. It's nice to get feedback so I appreciate the comments about my videos.

Glad the video helped.

@@DavidWrightUK thx it helped me 2

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It's great that this video has helped so many people to understand this topic. I'm glad it helped you and wish you all the best with your studies.

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I'm glad the video helped you understand this topic. Best f luck with your studies 😎

I'm glad the video helped and wish you luck for your exam next week.

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I'm glad this video helped you. It's been my most popular video and I'm pleased it has helped a lot of people to understand this tricky topic. Best of luck with your studies 😎 👍

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It's great that this video has helped you catch up after having COVID. Good luck with your assessment and the rest of your studies.

@@DavidWrightUK god bless u man

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100% is perfect. I hope you get the same result in your test tomorrow and hope that the video contains enough info to help you answer all the questions

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I'm glad it helped.

I plan to make Chemistry videos one day, but am focussing on maths at present. I used to be a Chemistry teacher before I moved into maths.

The answer is 12000 (3 s.f.). This is because the first three significant figures are 120 and you then need two more zeros as place holders so that the magnitude of your answer is the same as the number you started with. Hope this makes sense and helps.

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You have to put a zero after the 1 so that the magnitude (size) of the number is the same; i.e. 12 has two digits so you need an answer with two digits. If you rounded 12.0025 to 2 s.f. the answer would be 12. However, if you rounded 10.0025 to 2 s.f. the answer would also be 10, so sometimes you get the same answer if it is 1 s.f. or 2 s.f. that is why it is important to write (1 s.f.) or (2 s.f.) after your answer. I hope this makes sense. Lots of people get confused about this, so I hope this helps people to understand an issue that can often lead to errors. Best of luck with your studies.

Glad the video helped. Significant figures seems to be one of those 'tricky' topics because it isn't something that people come across every day.

Thank you. :)

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Thanks for such great feedback. Much appreciated and best of luck with your studies.

Much appreciated. Many thanks.

yep! think of it as rounding 79 into 80

Yes, this is right. Adding the zero is necessary to show that you have rounded to 4 s.f. .

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I hope the maths exam went well and wish you all the best with your studies.

@@DavidWrightUK Thank you🙏 And the exam was easy

Thank you! 😃

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At high school level you are usually asked to round a number to specified number of significant figures, such as 2 s.f. or 3 s.f. Therefore, there isn't a significant figure that you usually need to find. However, when you are rounding a number you need to think about how accurate your data is and this can affect how many significant figures you choose to round your calculation to. For example, it you are doing a calculation in physics that has data that is only accurate to the nearest metre, then you should only round your calculation to the same accuracy, since there would be no point rounding your answer to millimetres if the original data is a lot less precise. I am guessing that this is what you may mean when you ask about finding a significant figure. My advice is to think about the accuracy of the original data and use this to make a decision. It is also important to only round a number after all of the calculation steps have been completed. Otherwise an error will be introduced. Hope this helps. Good luck with your test.

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RU-vid is definitely a great invention. I'm glad the video helped.

@@DavidWrightUK same

You're welcome 😊 Glad it was helpful.

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@@DavidWrightUK Thank you so much😊

thats my teacher speeed in explanation

This is a good idea for people who speak English as their first language. The slower speed is good for students who speak English as a second language, or who want to take their time to work through the examples along with the video.

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I hope it helped you to answer your question.

Yes and thank you👍

I admire the dedication. Good luck with your maths.

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Glad to be of help. Best of luck with your studies.

That's brilliant news. I'm glad it went well. This summer, I plan to upload more videos about the trickier topics to help students get higher grades. We'll done.

I'm glad it helped. Leave a comment on my site if there are ever any other topics that you need help with. Best of luck with your exams.

@@DavidWrightUK thank you sir

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Thank you

Glad the video helped. It would be nice if all of my maths videos were as popular as this one.

Hopefully my answer to your other comment will help you with this. Think about how accurate to your data is. For example, there is no point rounding measurements taken in centimetres to six significant figures because measurements in cm are not very precise. Your teacher should be able to help you with this. Rounding to three significant figures is common in chemistry and physics.

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You should write 12.0 (3 s.f.) if you are specifically being asked for 3 significant figures. It helps to indicate what the magnitude of the number was before it was rounded.

@@DavidWrightUK thank you. Top man

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Good luck with your test. Hope everything goes well.

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