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Worksheet: Subtraction within 20 by Counting Backward on a Number Line
Q5:
Robert was playing a game. First, he moved his counter 8 spaces forward. Then, he moved it 3 spaces backward.
How many spaces from the start is his counter?
Q6:
On this number line, Daniel started at 20 and counted backward until he reached 15.
Which number sentence describes what Daniel did?
- A20 − 2 = 15
- B20 − 1 = 15
- C20 − 3 = 15
- D20 − 5 = 15
- E20 − 4 = 15
Q7:
Count back to subtract.
Find the difference.
- A 1
- B 9
- C 6
Q8:
I start at a number and count backward. Does this represent adding or subtracting?
- Asubtracting
- Badding
Q9:
On this number line, Ethan started at 5 and counted back three. Which of these describes what Ethan did?
- Atook away two
- Badded three
- Cadded two
- Dtook away three
- Etook away one
Q10:
Use the number line to complete the following subtraction sentence.
Q11:
Fill in the missing number.
Use the number line if you need to.