Video: Crossing Ten When Subtracting on a Number Line

What is 13 minus 4? 13 − 4 = _. Hint: Finish the calculation on the number line: How many more do you have to take away?

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Video Transcript

What is 13 minus four? 13 minus four equals what. Hint: Finish the calculation on the number line. How many more do you have to take away?

We’re being asked to calculate 13 take away four using a number line. We’ve started to count back from 13 on the number line. We’ve counted back three spaces, and we’ve landed on number 10. We need to subtract four. We’ve already subtracted three. How many more do we need to subtract?

We know that three and one makes four, so we need to subtract one more. We landed on number nine. 13 minus four is nine. First, we subtracted three to take us to 10. Then we subtracted one more. To subtract four, first we can subtract three and then subtract one more. 13 minus four is nine.

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