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.

  • A36+4+3
  • B36+5+2
  • C36+4+2
  • D36+5+3

Pick the calculation that is equal to 36+7.

  • A40+4
  • B40+5
  • C40+3
  • D40+2

What is 36+7?

Q2:

Make a ten to add.

Pick the calculation that is equal to 54+8.

  • A60+1
  • B60+6
  • C60+2
  • D60+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.

Who has the right answer?

  • AJacob
  • BWilliam

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