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Maths lesson · Addition and subtraction

How to add with regrouping

When a column makes ten or more, write the ones and carry the ten to the next column.

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Step 6 of 647 + 38 = 85. Written in the answer so far: 8 in the tens, 5 in the ones.OT4738+158
47 + 38 = 85.

Practise on paper. This week’s adding with regrouping sheet: 12 questions with a worked example, new every Monday.

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How to work it out

47 + 38

6 steps

  1. Step 1Set out 47 + 38 in columns: ones under ones, tens under tens.
  2. Step 2Add the ones: 7 + 8 = 15.
  3. Step 3Regroup: 15 ones is 1 ten and 5 ones. Write 5, and carry the 1 to the tens.
  4. Step 4Add the tens: 4 + 3, and the 1 carried, makes 8.
  5. Step 58 is less than ten. Write 8 in the tens column.
  6. Step 647 + 38 = 85.

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About this lesson

Regrouping (also called carrying) happens when a column adds up to ten or more. Ten ones make one ten, so your child writes the ones digit in the answer and carries the ten to the top of the tens column, where it is added with the other tens. The same idea carries ten tens into the hundreds.

What your child learns

  • Add two two-digit numbers where the ones make ten or more.

Australia · Year 2: Australian Curriculum v9 · AC9M2N04

Practise adding with regrouping

This week’s practice sheet is ready to print, with a worked example at the top.

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