CPM Homework Help : CC1MN Problem 2-19

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2-19.

Find the missing number that makes each of the following number sentences true.

$15 \cdot \ ? =90$
Hint (a):
Rearrange the equation to solve for the unknown number.
$? = \frac{90}{15}$
Answer (a):
$6$

$\frac{90}{?}=18$

Hint 1 (b):
Rearrange the equation to solve for the unknown number.
Hint 2 (b):
$(18)(?)=90$

$6 \cdot \ ? = 96$

Hint (c):
Follow the steps in part (a).
Answer (c):
$16$

$\frac{?}{11}=13$

Hint (d):
This is the same as $?=(13)(11)$ .

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