Example 1 : 99 * 99
Step 1 : We know that square of 9 = 81
Step 2 : Number of digits in 99 = 2
Step 3 : In 81 place one less 9 then the number of digits in 99 before 8.
Step 4 : In 81 place one less 0 then the number of digits in 99 before 1.
Step 4 : 9801(It’s the final answer)
Please try :
999
9999
