Question

Which property justifies that 45*37 = 42(30) + 42(7)?

Answer 1

45 is just 40 + 5

Separate the number into its components by its position

ones, tens, hundreds, thousands, etc..

Answer 2

original choices

A. distributive B. commutative C. associative D. identity

trying not to give too much away but it's one of these properties basically applied in reverse