Carl wants to find the product
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.