Video: Dividing by 10 within 120 Using Times Table Fact

Here are two number sentences that have a missing number. _ × 10 = 20. 20 ÷ 10 = _. What is the missing number that completes both of the number sentences? [A] 30 [B] 3 [C] 10 [D] 2

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Video Transcript

Here are two number sentences that have a missing number. What times 10 equals 20. 20 divided by 10 equals what. What is the missing number that completes both of the number sentences? Is it 30, three, 10, or two?

We’re being asked to find these two missing numbers. And we’re told that the missing numbers are the same number. So which number would fit in both of these number sentences? In this sentence, we have to find the number that we multiply by 10 to give us a product of 20. What times 10 is 20? We know that one lot of 10 is 10 and two lots of 10 makes 20. One times 10 is 10; two times 10 is 20. We found our first missing number. We modeled the number 20 using blocks of 10. And we used our knowledge of the 10 times table to say that two times 10 equals 20. If two times 10 is 20, then 20 divided by 10 equals two. This is the missing number that completes both number sentences. Two times 10 equals 20. 20 divided by 10 equals two.

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