Addition with Regrouping: 12,345 + 4,805

Addition with Regrouping Calculator
First addend
Second addend

What is 12,345 + 4,805?

Answer

12,345 + 4,805 =
17,150

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

12,345 + 4,805 in a column. Carries are the small circled digits above the columns.
1carry1carry
1 2 3 4 5
+4805
17150

Column by column: 12,345 + 4,805

  • Ones: 5 + 5 = 10 — write 0, carry 1.
  • Tens: 4 + 0 + 1 = 5 — write 5.
  • Hundreds: 3 + 8 = 11 — write 1, carry 1.
  • Thousands: 2 + 4 + 1 = 7 — write 7.
  • Ten thousands: nothing to add — write 1.

12,345 + 4,805 = 17,150

Second check: 17,150 − 12,345 = 4,805

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Column additions with 4,805

ExampleSum
12,340 + 4,80517,145
12,341 + 4,80517,146
12,342 + 4,80517,147
12,343 + 4,80517,148
12,344 + 4,80517,149
12,345 + 4,80517,150
12,346 + 4,80517,151
12,347 + 4,80517,152
12,348 + 4,80517,153
12,349 + 4,80517,154
12,350 + 4,80517,155

FAQ

What is 12,345 + 4,805?

12,345 + 4,805 = 17,150

How do you check that 12,345 + 4,805 = 17,150?

Subtract one addend from the sum: 17,150 − 4,805 = 12,345, and 17,150 − 12,345 = 4,805. Getting the other addend back means the sum is right.

How many carries are there in 12,345 + 4,805?

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 4,805 + 12,345 the same as 12,345 + 4,805?

Yes. Addition is commutative, so both give 17,150; the column looks the same with either number on top.

See Also