Use the model to find the missing number in the pair of equivalent expressions. 15 + 9 = ?(5 + 3) What number is missing from the expression?

Jerem asked Apr 12, 2023

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Jerem asked Apr 12, 2023

by Jerem

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20 votes

Let:

x = Missing number

15 + 9 = x(5 + 3)

24 = 5x + 3x

24 = 8x

Solving for x:

24/8 = x

3 = x

x = 3

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