Addition with Regrouping: 1,977 + 23

Addition with Regrouping Calculator
First addend
Second addend

What is 1,977 + 23?

Answer

1,977 + 23 =
2,000

With regrouping: 3 carries — into the tens, the hundreds and the thousands

1,977 + 23 in a column. Carries are the small circled digits above the columns.
1carry1carry1carry
1 9 7 7
+23
2000

Column by column: 1,977 + 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: 1 + 1 = 2 — write 2.

1,977 + 23 = 2,000

Second check: 2,000 − 1,977 = 23

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9,977 + 2310,000

FAQ

What is 1,977 + 23?

1,977 + 23 = 2,000

How do you check that 1,977 + 23 = 2,000?

Subtract one addend from the sum: 2,000 − 23 = 1,977, and 2,000 − 1,977 = 23. Getting the other addend back means the sum is right.

How many carries are there in 1,977 + 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 + 1,977 the same as 1,977 + 23?

Yes. Addition is commutative, so both give 2,000; the column looks the same with either number on top.

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