Mr. Bean only doing basic arthimetic, it is not even mr bean some people just customise them as Mr bean to gain money, please don't compare albert Einstein to those peoples
The simplest way Only if the axiom of equivalence is applied The difference between 110 and 109 is only 1 So 110×y -109×y =x(Than 109×y many y) x=x-y For example:110×8-109×8 =880-8 =872 109×1=110×1-1=109 109×2=110×2-2=218 109×3=110×3-3=327 109×4=110×4-4=436 109×5=110×5-5=545 109×6=110×6-6=654 109×7=110×7-7=763 109×8=110×8-8=872 109×9=110×9-9=981
109 ×2 = 110×2 -2 = 218 109 × 3 = 110×3-3 = 327 And so one Or... it is like 100 × 2 + 9×2 200 + 18 = 18 I just figured this out before reading your comment by myself... is it similar? Thanks for explaining it in detail btw 😊
9x1= 9 9x2= 18 9x3= 27 9x4= 36 9x5= 45 9x6= 54 9x7= 63 9x8= 72 9x9= 81 9x10= 90 The first digit gets +1 and the second digit gets -1. The first digit resets if it reaches 9 and the second digit if it reaches 0.
A little simpler trick 109×10+109x9=109² Another one if u want to take out a no. For Example 109 multiplied by a even no. Then 109+109=109×2 109×2+109×2= 109×4 109×4+109×2=109x8 Just like that it will be helpful if u r good at addition or doubling a no. In ur mind itself