Section B Section B Checkpoint

Problem 1

There are 24 students in the choir. They are standing in 3 equal rows. How many students are in each row? Select all equations that represent this situation.

3 \times 12 = {?}

3 \times {?} = 24

24 \times 3 = {?}

{?} \div 24 = 3

24 \div 3 = {?}

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Solution

B, E

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Sample Response

B, E

Problem 2

Han knows $4 \times 5 = 20$ and $4 \times 3 = 12$ .

Mark or shade the diagram to show how Han can use these facts to find the value of $4 \times 8$ . Explain your reasoning.

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Solution

Sample response:

The shaded part is $4 \times 5$ or 20 and the unshaded part is $4 \times 3$ , or 12, so the total number of small squares is $20 + 12$ or 32. It's also $4 \times 8$ .

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Sample Response

Sample response:

The shaded part is $4 \times 5$ or 20 and the unshaded part is $4 \times 3$ , or 12, so the total number of small squares is $20 + 12$ or 32. It's also $4 \times 8$ .

Problem 3

Find the value of each product.

$5 \times 3=\underline{\hspace{1 cm}}$
$6 \times 3=(5\times3)+\underline{\hspace{1 cm}}$
$6 \times 6=(6\times3)\times\underline{\hspace{1 cm}}$

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Solution

15
3 or $1\times3$
2

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Sample Response

15
3 or $1\times3$
2