Guess this riddle?
2x2 = 6
3x3 = 12
4x4 = 20
5x5 = 30
8x8 = 72
9x9 = ?
To solve the problem:
First, multiply two numbers, then add the same number and get the total.
2x2 + 2 = 6
3x3 + 3 = 12
4x4 + 4 = 20
5x5 + 5 = 30
8x8 + 8 = 72
9x9 + 9 = 90