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Worksheet: Addition within 20 by Counting on a Number Line

Q1:

Count on to add.

Find the total.

Q2:

Victoria was playing a game. First, she moved her counter 4 spaces forward. Then, she moved it 7 spaces forward.

How many spaces from the start is her counter?

Q3:

Use the number line to complete the following addition sentence.

Q4:

On this number line, Deborah started at 13 and counted forward until she reached 18.

Which number sentence describes what Deborah did?

  • A13 + 3 = 18
  • B13 + 1 = 18
  • C18 − 5 = 13
  • D13 + 5 = 18
  • E18 − 4 = 14

Q5:

Fill in the missing number.

Use the number line if you need to.

Q6:

Count on to add.

Find the total.

  • A 16
  • B 14
  • C 15

Q7:

Count on to add.

Find the total.

  • A 12
  • B 13
  • C 14

Q8:

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

Which of the following describes what Sophia did?

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

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.

Q11:

Count on to add.

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

Q12:

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

  • Aadding
  • Bsubtracting

Q13:

To find the sum of 1 1 + 6 , we can use a number line.

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

So, we now know that 1 1 + 6 = 1 7 .

Use a number line to find the sum of 1 3 + 6 .

Q14:

Find the number sentence that matches this number line.

  • A3 + 3 = 8
  • B3 + 4 = 8
  • C8 − 5 = 3
  • D3 + 5 = 8
  • E8 − 4 = 4