Worksheet: Adding One-Digit Numbers to Two-Digit Numbers by Breaking Apart Ones

In this worksheet, we will practice how to add one-digit numbers to two-digit numbers by making a ten and adding the remaining ones and record this with horizontal addition.

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

Pick the calculation that is equal to 3 6 + 7 .

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

What is 3 6 + 7 ?

Q2:

Make a ten to add.

Pick the calculation that is equal to 5 4 + 8 .

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

What is 5 4 + 8 ?

Q3:

James and Hannah are using base ten blocks to help them find the sum of 26 and 8.

Their teacher asks them if they will need to regroup when adding.

Who is correct?

  • A
  • B

Find the sum.

Q4:

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

All of these have the same sum.

He showed that 4 8 + 5 is the same as 5 0 + 3 . What is 4 8 + 5 ?

Make a ten to find the answer to 5 6 + 9 .

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