Question

Which way shows one way you can decompose 15 to find 42 x 15?

A. О (42 + 10) (42 + 5)
B. O (42 + 10) + (42 + 5)
C.O (42 x 10) + (42 * 5)
D. O (42 x 1) + (42 x 5)

Answer 1

42 * 10 + 42 * 5

which agrees with the third option (C) shown on the list of possible answers

Explanation:

Notice that using distributive property we can write:

42 * 15 = 42 (10 + 5) = 42 * 10 + 42 * 5

which agrees with the third option (C) shown on the list of possible answers.