# Worksheet: Adding by Breaking Apart Ones

In this worksheet, we will practice adding a 1-digit number to a 2-digit number by breaking apart ones and model this with equations.

**Q1: **

We can make a ten to help us add 36 and 7.

Break apart 7 to make a ten.

Pick the matching calculation.

- A
- B
- C
- D

Pick the calculation that is equal to .

- A
- B
- C
- D

What is ?

**Q3: **

Look at how Mohammed added by breaking apart ones to make a ten.

All of these have the same sum.

He showed that is the same as . What is ?

Make a ten to find the answer to .

**Q4: **

This is how Benjamin added , by breaking apart ones to make tens.

Help him find the final result.

**Q5: **

When adding , we break apart ones to make tens as shown.

What is the missing number?

What is the result of ?

**Q6: **

Ethan tried to calculate by breaking apart ones to make a ten.

Which diagram should be in the blank space?

- A
- B
- C
- D

What is the result of ?

**Q7: **

James has 18 marbles. If his friend David gives him 6 marbles, how many marbles will James have?

*Hint*: Can you make a ten?

**Q8: **

Noah is adding . He tried to break ones apart to make tens.

What is the missing number in his calculation?

What is the result of ?

**Q9: **

When calculating , we break apart ones to make tens, as shown.

What is the missing number?

What is the result of ?

**Q10: **

Jacob and William tried to solve by breaking apart ones to make a ten as shown.

Who has the right answer?

- AJacob
- BWilliam