Addition with Regrouping: 977 + 23

Addition with Regrouping Calculator
First addend
Second addend

What is 977 + 23?

Answer

977 + 23 =
1,000

The sum is longer than the addends: 3 carries — into the tens, the hundreds and the thousands; the last one makes a new digit

977 + 23 in a column. Carries are the small circled digits above the columns.
1carry1carry1carry
9 7 7
+23
1000

Column by column: 977 + 23

  • Ones: 7 + 3 = 10 — write 0, carry 1.
  • Tens: 7 + 2 + 1 = 10 — write 0, carry 1.
  • Hundreds: 9 + 1 = 10 — write 0, carry 1.
  • Thousands: the carried 1 — write 1.

977 + 23 = 1,000

Second check: 1,000 − 977 = 23

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485 + 23508
536 + 23559
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647 + 23670
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877 + 23900
977 + 231,000
1,977 + 232,000
4,977 + 235,000
9,977 + 2310,000

FAQ

What is 977 + 23?

977 + 23 = 1,000

How do you check that 977 + 23 = 1,000?

Subtract one addend from the sum: 1,000 − 23 = 977, and 1,000 − 977 = 23. Getting the other addend back means the sum is right.

How many carries are there in 977 + 23?

3 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 23 + 977 the same as 977 + 23?

Yes. Addition is commutative, so both give 1,000; the column looks the same with either number on top.

See Also