Question Video: Counting by 10s Mathematics • 3rd Grade

David bought 3 boxes of pencils; each box has 10 pencils. How many pencils does David have in total?

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Video Transcript

David bought three boxes of pencils. Each box has 10 pencils. How many pencils does David have in total?

In this word problem, we’re being asked to work out the total number of pencils that David has. We know that he bought three boxes of pencils and each box contains 10 pencils. Let’s sketch a bar model to help us think about how to calculate the answer. Our bar model has three parts. This is because David bought three boxes of pencils. And we know that each box has 10 pencils inside. We’ve got three lots of 10. So we can multiply 10 by three to find the answer. We just need to count in tens three times: 10, 20, 30. 10 times three is 30. If David bought three boxes of pencils and each box contains 10 pencils, he will have 30 pencils in total.

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