Carl wants to find the product

Question

30
×
5
6
.
Which of the following best explains how he can find the product mentally?

Answer 1

Carl can find the product mentally by breaking down the numbers into easier to work with numbers. He can break 30 into 3 × 10 and 5 × 6 into 30. Then he can multiply 3 × 10 to get 30 and 30 × 30 to get 900. The product of 30 × 56 is 900.