Addition with Regrouping: 12,345 + 3,579

Addition with Regrouping Calculator
First addend
Second addend

What is 12,345 + 3,579?

Answer

12,345 + 3,579 =
15,924

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

12,345 + 3,579 in a column. Carries are the small circled digits above the columns.
1carry1carry
1 2 3 4 5
+3579
15924

Column by column: 12,345 + 3,579

  • Ones: 5 + 9 = 14 — write 4, carry 1.
  • Tens: 4 + 7 + 1 = 12 — write 2, carry 1.
  • Hundreds: 3 + 5 + 1 = 9 — write 9.
  • Thousands: 2 + 3 = 5 — write 5.
  • Ten thousands: nothing to add — write 1.

12,345 + 3,579 = 15,924

Second check: 15,924 − 12,345 = 3,579

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Column additions with 3,579

ExampleSum
12,340 + 3,57915,919
12,341 + 3,57915,920
12,342 + 3,57915,921
12,343 + 3,57915,922
12,344 + 3,57915,923
12,345 + 3,57915,924
12,346 + 3,57915,925
12,347 + 3,57915,926
12,348 + 3,57915,927
12,349 + 3,57915,928
12,350 + 3,57915,929

FAQ

What is 12,345 + 3,579?

12,345 + 3,579 = 15,924

How do you check that 12,345 + 3,579 = 15,924?

Subtract one addend from the sum: 15,924 − 3,579 = 12,345, and 15,924 − 12,345 = 3,579. Getting the other addend back means the sum is right.

How many carries are there in 12,345 + 3,579?

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 3,579 + 12,345 the same as 12,345 + 3,579?

Yes. Addition is commutative, so both give 15,924; the column looks the same with either number on top.

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