Video: Using Number Lines to Find the Missing Subtrahend in a Subtraction Equation

Fill in the missing number. Use the number line if you need to.

01:23

Video Transcript

Fill in the missing number. Use the number line if you need to.

Our missing number is here in the blue box. It says 16 minus some number equals eight. On our number line, we’ll start with 16. The blue dot is on 16. And we know that our final answer, or the place where we finish, is at eight. So I put a pink dot at the eight.

The question is, how did we go from 16 to eight? How many numbers did we take away? Subtraction is like moving to the left on the number line. Let’s see how many spaces to the left we moved from 16 to eight: one, two, three, four, five, six, seven, eight. From 16 to eight is left eight spaces. And that tells us that 16 minus eight equals eight.

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