# 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 ?

Q2: 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. 