Each digit of a 9 digit number is 1 It is multiplied by itself What is the sum of the digits of the ...........

Math and Mental Ability Number System

Each digit of a 9-digit number is 1. It is multiplied by itself. What is the sum of the digits of the resulting number ?

This questions was previously asked in

Complete-Test, Previous year (2023)

100

- The number you are working with is 111,111,111.

- When you multiply 111,111,111 by itself, you get 12,345,678,987,654,321.

- To find the sum of the digits, add each digit together: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 81.

- Option 1: 64 - This is incorrect because the sum of the digits is greater.

- Option 2: 80 - This is incorrect, as the sum is 81.

- Option 3: 81 - Correct, as the calculated sum is indeed 81.

- Option 4: 100 - This is incorrect, as the sum is lower.

Submit Error