Worksheet: Subtraction within 20 by Counting Backward on a Number Line

In this worksheet, we will practice using a number line to subtract within 20 by counting back and writing subtraction sentences describing jumps on a number line.

Q1:

Find the number sentence that matches this number line.

  • A9 − 5 = 2
  • B9 − 6 = 2
  • C2 + 7 = 9
  • D9 − 7 = 2
  • E2 + 6 = 9

Q2:

Fill in the missing number.

Use the number line if you need to.

Q3:

On this number line, Fares started at 20 and counted backwards until he reached 15.

Which number sentence describes what Fares did?

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

Q4:

Count back to subtract.

Find the difference.

Q5:

Count back to subtract.

Find the difference.

  • A 8
  • B 7
  • C 6

Q6:

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

  • Asubtracting
  • Badding

Q7:

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

Q8:

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?

Q9:

Count back to subtract.

Find the difference.

  • A 1
  • B 9
  • C 6

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.

Q12:

Fill in the blanks in the figure below from left to right.

  • A8, 3, 0
  • B6, 2, 4
  • C8, 3, 7
  • D8, 3, 8
  • E6, 2, 7

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