0As we learned from my previous lesson
i,e; (In case of two 2-digited numbers whose digits in 10's place are same and sum of the digits in unit places is 10
For example:- 38 and 32 (10's place digits are equal and 8+2=10)
38×32 can be found very easily
3×(3+1)×100=1200 (the number in 10's place × next number tio it ×100
8×2 =16 (product of digits in unit places)
add the result and get the product
38×32=1200+25=1225
That's the result.
We can apply it to find square of numbers ending with digit 5
35×35 = (3×4×100)+(5×5) =1225
So, square of 35=1225
Practice more
square of 85= 8×9×100+ 5×5 = 7200+25 =7225
Is it not interesting?
