The diagram above is a number line. A number line shows numbers in order. A number line
has arrows because it keeps going and going in both directions. All numbers can be shown
on a number line.

Fill in the missing numbers on the number lines below.

<--0-- -- -- -- -- -- -- -- -- --10-->

<--9-- -- -- -- -- -- -- -- -- --19-->

<--17-- -- -- -- -- -- -- -- -- --27-->

You can use a number line to add and subtract numbers.

For example, to find the sum of 5 and 6, first find the 5 on the number line, then move
to the right 6 numbers. You end on the number 11. So, 5 + 6 = 11.

Use the number line below to find the sum of two numbers.

4 + 4 =

3 + 5 =

1 + 4 =

2 + 7 =

5 +
= 8

2 +
= 5

+ 6 = 9

+ 4 = 7

You can use number lines to subtract. To find the difference between 9 and 4, start on
the nine and move to the left 4 numbers. You end on the number 5. The difference between 9
and 4 equals 5 or 9 - 4 = 5.

Use the number line below to find the difference between two numbers.

9 - 5 =

8 - 4 =

7 - 3 =

6 - 2 =

- 7 = 2

- 4 = 2

- 3 = 5

- 6 = 7

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