Worksheet: Addition within 20 by Counting on a Number Line

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In this worksheet, we will practice adding within 20 by counting on a number line and writing addition sentences describing jumps on the number line.

Q1:

Use the number line to complete the following addition sentence.

Q2:

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

Which number sentence describes what Farida did?

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

Q3:

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

Aadding
Bsubtracting

Q4:

Count on to add.

Find the total.

A 16
B 14
C 15

Q5:

Count on to add.

Find the total.

Q6:

Yara 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?

Q7:

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

Which of these describes what Amira did?

Aadded seven
Btook away three
Ctook away seven
Dadded three
Eadded four

Q8:

Find the number sentence that matches this number line.

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

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:

Fill in the missing number.

Use the number line if you need to.

Q12:

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

Start at 11
Count on 6
Land on 17

So, we now know that .

Use a number line to find the sum of .

Q13:

Count on to add.

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

A 18
B 16
C 17

Q14:

Count on to add.

Find the total.

A 12
B 13
C 14