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Goal: How do you solve word problems on a number line?

Frido’s carrot was 20 inches long. He used his laser eye to cut off 13 inches. How long is his carrot now?

Step 1

This word problem is asking us to subtract. Do you know what the subtraction sentence is?

Frido’s carrot was 20 inches long. He used his laser eye to cut off 13 inches. How long is his carrot now?

___ - ___ = ___

Step 2

Let’s find the difference of 20 - 13. First, find the whole of the subtraction sentence on the number line. Place a dot above it.

Step 3

If 20 is the whole of the subtraction sentence, then 13 is the part. What digits make up the number 13?

Step 4

13 is made up of 1 ten and 3 ones. In order to subtract 13, we can jump to the left by ten one time. Then, we can jump one three times.

Step 5

The number the last jump lands on is the difference.

That means Frido’s carrot is now 7 inches long!

We should begin jumping from 46 because it is the whole. Then, we jump 2 tens and 1 one to the left. The difference is 25.

Correct! We begin jumping from 46 because it is the whole. Then, we jump 2 tens and 1 one to the left. The difference is 25.

Questions answered correctly:

Questions answered incorrectly:

Solve word problems on a number line.