Carl wants to find the product

Question

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

A.
He knows that
30
÷
5
is 6. He then multiplies 6 by 6 to get 36.

B.
He knows that
30
×
6
6
is 30. He then subtracts 1 from 30 to get 29.

C.
He knows that
3
×
6
=
18
. He then adds 18 and 5 to get 23.

D.
He knows that
30
×
1
6
is 5. He then multiplies 5 by 5 to get 25.

Answer 1

A. He knows that 30÷5 is 6. He then multiplies 6 by 6 to get 36.