Question

To add 20.4 + 3.75 + 4.25, Crystal first added 3.75 and 4.25. Which property did Crystal use to add mentally?

A. Associative Property of Addition
B. Commutative Property of Addition
C. Distributive Property
D. Identity Property of Addition

Answer 1

Associative Property of Addition

Explanation:

From the list of given options, option A correctly answers the question and this is because

`a + b + c = a + (b + c)` --- (1)

or

`a + b + c = (a + b) + c` --- (2)

The above illustrations only apply to Associative Property of Addition

In Crystal's case:

`20.4 + 3.75 + 4.25 = 20.4 + (3.75 + 4.25)`

This can be compared to (1) above

Hence;

Option A answers the question