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.
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
I start at a number and count backward. Does this represent adding or subtracting?
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
Count back to subtract.
Find the difference.
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.
Benjamin started his calculation on the number line. Help him finish it to find the difference.
Remember: Count back to subtract.