Addition with Regrouping: 1,422 + 578

Addition with Regrouping Calculator
First addend
Second addend

What is 1,422 + 578?

Answer

1,422 + 578 =
2,000

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

1,422 + 578 in a column. Carries are the small circled digits above the columns.
1carry1carry1carry
1 4 2 2
+578
2000

Column by column: 1,422 + 578

  • Ones: 2 + 8 = 10 — write 0, carry 1.
  • Tens: 2 + 7 + 1 = 10 — write 0, carry 1.
  • Hundreds: 4 + 5 + 1 = 10 — write 0, carry 1.
  • Thousands: 1 + 1 = 2 — write 2.

1,422 + 578 = 2,000

Second check: 2,000 − 1,422 = 578

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Column additions with 578

ExampleSum
1,417 + 5781,995
1,418 + 5781,996
1,419 + 5781,997
1,420 + 5781,998
1,421 + 5781,999
1,422 + 5782,000
1,423 + 5782,001
1,424 + 5782,002
1,425 + 5782,003
1,426 + 5782,004
1,427 + 5782,005

FAQ

What is 1,422 + 578?

1,422 + 578 = 2,000

How do you check that 1,422 + 578 = 2,000?

Subtract one addend from the sum: 2,000 − 578 = 1,422, and 2,000 − 1,422 = 578. Getting the other addend back means the sum is right.

How many carries are there in 1,422 + 578?

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 578 + 1,422 the same as 1,422 + 578?

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

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