Addition with Regrouping Calculator

Example: 348 + 256 in a column

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

Practice examples with answers

Solve it on paper, then open the example: the page shows the answer and the whole column.

2-digit, no regrouping

2-digit, with regrouping

3-digit numbers

Multi-digit (grade 4)

Common mistakes

• Forgetting the carry: 348 + 256 then comes out as 594 instead of 604 — the 1 from 8 + 6 = 14 never reaches the tens.
• Lining the numbers up on the left: 453 + 89 then turns into 453 + 890 = 1,343 instead of 542. Ones go under ones.
• Writing the whole column sum: 8 + 6 = 14 is written as 4 with 1 carried, not as 14 under the ones.