Which property would allow you to use mental computation to simplify the problem 27 + 15 + 3 + 5?
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The property that would allow you to use mental computation to simplify the problem 27 + 15 + 3 + 5 is the Associative Property of Addition.
The property that would allow you to use mental computation to simplify the problem 27 + 15 + 3 + 5 is the associative property of addition.
To apply the associative property, you can group the numbers together in any way you like without changing the sum. In this case, you can choose to group 27 and 15 together, and then group 3 and 5 together.
So, you can simplify the expression by adding:
(27 + 15) + (3 + 5)
Grouping the numbers, you have:
42 + 8
Now, you can calculate the sum mentally:
42 + 8 = 50
Therefore, by applying the associative property of addition, you can simplify the problem 27 + 15 + 3 + 5 to 50.
commutative and associative
27 + 15 + 3 + 5
= 27 + 3 + 15 + 5
= 30 + 20
= 50