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 3 6 + 4 + 3
  • B 3 6 + 5 + 2
  • C 3 6 + 4 + 2
  • D 3 6 + 5 + 3

Pick the calculation that is equal to 36+7.

  • A 4 0 + 4
  • B 4 0 + 5
  • C 4 0 + 3
  • D 4 0 + 2

What is 36+7?

Q2:

Make a ten to add.

Pick the calculation that is equal to 54+8.

  • A 6 0 + 1
  • B 6 0 + 6
  • C 6 0 + 2
  • D 6 0 + 4

What is 54+8?

Q3:

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

All of these have the same sum.

He showed that 48+5 is the same as 50+3. What is 48+5?

Make a ten to find the answer to 56+9.

Q4:

This is how Benjamin added 27+8, by breaking apart ones to make tens.

Help him find the final result.

Q5:

When adding 74+7, we break apart ones to make tens as shown.

What is the missing number?

What is the result of 74+7?

Q6:

Ethan tried to calculate 47+6 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 47+6?

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 39+8. He tried to break ones apart to make tens.

What is the missing number in his calculation?

What is the result of 39+8?

Q9:

When calculating 54+9, we break apart ones to make tens, as shown.

What is the missing number?

What is the result of 54+9?

Q10:

Jacob and William tried to solve 37+8 by breaking apart ones to make a ten as shown.