Addition with Regrouping: 877 + 23

Addition with Regrouping Calculator
First addend
Second addend

What is 877 + 23?

Answer

877 + 23 =
900

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

877 + 23 in a column. Carries are the small circled digits above the columns.
1carry1carry
8 7 7
+23
900

Column by column: 877 + 23

  • Ones: 7 + 3 = 10 — write 0, carry 1.
  • Tens: 7 + 2 + 1 = 10 — write 0, carry 1.
  • Hundreds: 8 + 1 = 9 — write 9.

877 + 23 = 900

Second check: 900 − 877 = 23

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Column additions with 23

ExampleSum
203 + 23226
239 + 23262
268 + 23291
277 + 23300
307 + 23330
348 + 23371
376 + 23399
402 + 23425
453 + 23476
485 + 23508
536 + 23559
578 + 23601
647 + 23670
677 + 23700
777 + 23800
877 + 23900
977 + 231,000
1,977 + 232,000
4,977 + 235,000
9,977 + 2310,000

FAQ

What is 877 + 23?

877 + 23 = 900

How do you check that 877 + 23 = 900?

Subtract one addend from the sum: 900 − 23 = 877, and 900 − 877 = 23. Getting the other addend back means the sum is right.

How many carries are there in 877 + 23?

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 23 + 877 the same as 877 + 23?

Yes. Addition is commutative, so both give 900; the column looks the same with either number on top.

See Also