Addition with Regrouping: 8,042 + 4,805

Addition with Regrouping Calculator
First addend
Second addend

What is 8,042 + 4,805?

Answer

8,042 + 4,805 =
12,847

The sum is longer than the addends: 1 carry — into the ten thousands; the last one makes a new digit

8,042 + 4,805 in a column. Carries are the small circled digits above the columns.
1carry
8 0 4 2
+4805
12847

Column by column: 8,042 + 4,805

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

8,042 + 4,805 = 12,847

Second check: 12,847 − 8,042 = 4,805

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Column additions with 4,805

ExampleSum
8,037 + 4,80512,842
8,038 + 4,80512,843
8,039 + 4,80512,844
8,040 + 4,80512,845
8,041 + 4,80512,846
8,042 + 4,80512,847
8,043 + 4,80512,848
8,044 + 4,80512,849
8,045 + 4,80512,850
8,046 + 4,80512,851
8,047 + 4,80512,852

FAQ

What is 8,042 + 4,805?

8,042 + 4,805 = 12,847

How do you check that 8,042 + 4,805 = 12,847?

Subtract one addend from the sum: 12,847 − 4,805 = 8,042, and 12,847 − 8,042 = 4,805. Getting the other addend back means the sum is right.

How many carries are there in 8,042 + 4,805?

1 carry: 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 4,805 + 8,042 the same as 8,042 + 4,805?

Yes. Addition is commutative, so both give 12,847; the column looks the same with either number on top.

See Also