Addition with Regrouping: 372 + 28

Addition with Regrouping Calculator
First addend
Second addend

What is 372 + 28?

Answer

372 + 28 =
400

With regrouping: 2 carries — into the tens and the hundreds

372 + 28 in a column. Carries are the small circled digits above the columns.
1carry1carry
3 7 2
+28
400

Column by column: 372 + 28

  • Ones: 2 + 8 = 10 — write 0, carry 1.
  • Tens: 7 + 2 + 1 = 10 — write 0, carry 1.
  • Hundreds: 3 + 1 = 4 — write 4.

372 + 28 = 400

Second check: 400 − 372 = 28

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FAQ

What is 372 + 28?

372 + 28 = 400

How do you check that 372 + 28 = 400?

Subtract one addend from the sum: 400 − 28 = 372, and 400 − 372 = 28. Getting the other addend back means the sum is right.

How many carries are there in 372 + 28?

2 carries: every time a column added up to 10 or more, its ones digit was written and 1 was carried to the next column on the left.

Is 28 + 372 the same as 372 + 28?

Yes. Addition is commutative, so both give 400; the column looks the same with either number on top.

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