Addition with Regrouping: 63 + 37

Addition with Regrouping Calculator
First addend
Second addend

What is 63 + 37?

Answer

63 + 37 =
100

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

63 + 37 in a column. Carries are the small circled digits above the columns.
1carry1carry
6 3
+37
100

Column by column: 63 + 37

  • Ones: 3 + 7 = 10 — write 0, carry 1.
  • Tens: 6 + 3 + 1 = 10 — write 0, carry 1.
  • Hundreds: the carried 1 — write 1.

63 + 37 = 100

Second check: 100 − 63 = 37

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FAQ

What is 63 + 37?

63 + 37 = 100

How do you check that 63 + 37 = 100?

Subtract one addend from the sum: 100 − 37 = 63, and 100 − 63 = 37. Getting the other addend back means the sum is right.

How many carries are there in 63 + 37?

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 37 + 63 the same as 63 + 37?

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