Lesson Worksheet: Adding Ones to Two-Digit Numbers with Regrouping Mathematics • 1st Grade

In this worksheet, we will practice adding a one-digit number to a two-digit number when crossing a ten and model this with place value equipment.


Make a ten to find 35+5.


James has 69 marbles. His friend gives him 4 more. How many marbles does he have now?


Calculate 35+5.

Tip: Use the place value blocks if you need to.


Which model represents 36+6?

  • A
  • B
  • C
  • D


Write the addition equation that matches the model.

  • A25+7=30
  • B20+7=32
  • C25+7=95
  • D25+7=32


David is using base ten blocks to help him add 9 to 34.

He adds the ones first. There are 13 ones.

Pick the model that shows what he should do.

  • A
  • B
  • C

Find the sum.


Pick a model that shows the sum.

Hint: Think about what happens when there are more than 10 ones.

  • A
  • B
  • C


David and Scarlett 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.


Using the base ten blocks, calculate 44+7.


Using the given model, find 28+4.

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