Evaluate the expression using the Commutative and Associative properties of numbers. Name the property used in each step.
13 + 23 + 12 + 7

Given:

The expression is:

To find:

The value of the given expression by using Commutative and Associative properties of numbers.

Solution:

We have,

Applying parenthesis and brackets, we get

            [Commutative properties of numbers]

            [Associative properties of numbers]

Using Associative properties of numbers, we get

              [Associative properties of numbers]

Therefore, the value of the given expression 55.

answer:

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