Video: Writing Equations Representing Multiplication Word Problems with a Symbol for the Unknown

A box of crayons has 2 rows. There are 7 crayons in each row. Noah has drawn this model to show the total number of crayons. Which of the following equations would he need to solve to find the number of crayons in the box? [A] 2 × 7 = [B] 2 + 7 = [C] 7 × 7 = [D] 2 + 2 = ? How many crayons are in the box?

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Video Transcript

A box of crayons has two rows. There are seven crayons in each row. Noah has drawn this model to show the total number of crayons. Which of the following equations would he need to solve to find the number of crayons in the box? Two multiplied by seven, two plus seven, seven multiplied by seven, or two plus two? How many crayons are in the box?

So our model shows that there are two rows: one, two. And there are seven crayons in each row: one, two, three, four, five, six, and seven. So we have two rows of seven, which is the same as saying two times seven. And the first part of our question asked us which of the following equations would Noah need to solve to find the number of crayons in the box. So from our working out, we can see that the answer would be two times seven.

And the second part of the question asks how many crayons there are in the box. To work out the answer to two times seven, we could count in twos. And we would need to count seven times. So let’s count together: two, four, six, eight, 10, 12, and 14. There are 14 crayons in the box.

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