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

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

**Q3: **

On this number line, Daniel started at 20 and counted backward until he reached 15.

Which number sentence describes what Daniel did?

- A20 − 5 = 15
- B20 − 2 = 15
- C20 − 4 = 15
- D20 − 3 = 15
- E20 − 1 = 15

**Q6: **

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

- Asubtracting
- Badding

**Q7: **

On this number line, James started at 5 and counted back three. Which of these describes what James did?

- Atook away one
- Btook away two
- Cadded two
- Dadded three
- Etook away three

**Q8: **

Count back to subtract.

Find the difference.

**Q11: **

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

Sophia put a bar of length 10 on the number line and took away a bar of length 4 to see how much was left.

Read how she showed this on the number line.

Write an equation to show what she did.

- A
- B
- C

**Q13: **

Benjamin started his calculation on the number line. Help him finish it to find the difference.

Remember: Count back to subtract.