# Lesson Worksheet: Adding Numbers up to 20 on a Number Line Mathematics • 1st Grade

In this worksheet, we will practice adding within 20 by jumping forward in ones on a number line.

**Q3: **

I start at a number and **count forward**. Does this represent adding or subtracting?

- Aadding
- Bsubtracting

**Q7: **

On this number line, Sophia started at 4 and counted forward three.

Which of the following describes what Sophia did?

- AShe added four.
- BShe added three.
- CShe added seven.
- DShe took away three.
- EShe took away seven.

**Q8: **

Find the number sentence that matches this number line.

- A3 + 4 = 8
- B8 − 4 = 4
- C3 + 5 = 8
- D8 − 5 = 3
- E3 + 3 = 8

**Q9: **

Fill in the missing number.

Use the number line if you need to.

**Q10: **

Fill in the missing number.

Use the number line if you need to.

**Q12: **

To find the sum of , we can use a number line.

- Start at 11
- Count on 6
- Land on 17

So, we now know that .

Use a number line to find the sum of .

**Q13: **

Count on to add.

Mia started this calculation on a number line. Finish the calculation to find the total.

**Q15: **

We can add numbers on number lines by thinking about length.

Anthony took a bar of length 13 and added a bar of length 6. Read how he showed this on the number line.

Write an addition equation to show what he did.

- A
- B
- C

**Q17: **

Write the addition equation.

- A
- B
- C