Addition with Regrouping: 72 + 28

Addition with Regrouping Calculator
First addend
Second addend

What is 72 + 28?

Answer

72 + 28 =
100

The sum is longer than the addends: 2 carries — into the tens and the hundreds; the last one makes a new digit

72 + 28 in a column. Carries are the small circled digits above the columns.
1carry1carry
7 2
+28
100

Column by column: 72 + 28

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

72 + 28 = 100

Second check: 100 − 72 = 28

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FAQ

What is 72 + 28?

72 + 28 = 100

How do you check that 72 + 28 = 100?

Subtract one addend from the sum: 100 − 28 = 72, and 100 − 72 = 28. Getting the other addend back means the sum is right.

How many carries are there in 72 + 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 + 72 the same as 72 + 28?

Yes. Addition is commutative, so both give 100; the column looks the same with either number on top.

See Also