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.