Addition with Regrouping: 8,042 + 3,579

Addition with Regrouping Calculator
First addend
Second addend

What is 8,042 + 3,579?

Answer

8,042 + 3,579 =
11,621

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

8,042 + 3,579 in a column. Carries are the small circled digits above the columns.
1carry1carry1carry
8 0 4 2
+3579
11621

Column by column: 8,042 + 3,579

  • Ones: 2 + 9 = 11 — write 1, carry 1.
  • Tens: 4 + 7 + 1 = 12 — write 2, carry 1.
  • Hundreds: 0 + 5 + 1 = 6 — write 6.
  • Thousands: 8 + 3 = 11 — write 1, carry 1.
  • Ten thousands: the carried 1 — write 1.

8,042 + 3,579 = 11,621

Second check: 11,621 − 8,042 = 3,579

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Column additions with 3,579

ExampleSum
8,037 + 3,57911,616
8,038 + 3,57911,617
8,039 + 3,57911,618
8,040 + 3,57911,619
8,041 + 3,57911,620
8,042 + 3,57911,621
8,043 + 3,57911,622
8,044 + 3,57911,623
8,045 + 3,57911,624
8,046 + 3,57911,625
8,047 + 3,57911,626

FAQ

What is 8,042 + 3,579?

8,042 + 3,579 = 11,621

How do you check that 8,042 + 3,579 = 11,621?

Subtract one addend from the sum: 11,621 − 3,579 = 8,042, and 11,621 − 8,042 = 3,579. Getting the other addend back means the sum is right.

How many carries are there in 8,042 + 3,579?

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 3,579 + 8,042 the same as 8,042 + 3,579?

Yes. Addition is commutative, so both give 11,621; the column looks the same with either number on top.

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