2-Digit Addition With Regrouping
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Two-digit addition with regrouping happens when a column's sum reaches 10 or more, so 10 ones must be regrouped as 1 ten and moved into the next column, such as 56 + 27 = 83. Every problem on this page requires at least one regroup (also called a carry), building the skill that comes right after place-value column addition.
This page is for second and third graders who've already mastered two-digit addition without regrouping and single-digit facts, plus parents and teachers checking whether a child understands regrouping conceptually rather than just following steps. Every problem here forces at least one regroup, so there's no way to get through it without exchanging 10 ones for 1 ten in the tens column.
What You'll Practice
- ✓ Two-digit addition problems where the ones column always sums to 10 or more
- ✓ Regrouping 1 ten from the ones column into the tens column
- ✓ Problems range from 15–99 + 15–99 to ensure every problem requires regrouping
- ✓ Instant feedback on every answer with streak and score tracking
How to Do Addition With Regrouping
Align the Columns
Write both numbers with ones digits aligned in one column and tens digits in another. Good alignment prevents errors.
Add the Ones — and Regroup
Add the ones column. If the sum is 10 or more, write the ones digit below and regroup 10 ones as 1 ten, placed above the tens column. Example: 7 + 8 = 15 → write 5, regroup 1 ten.
Add the Tens + Regrouped Ten
Add the tens column digits plus the regrouped 1. Write the result. Example: regrouped 1 + 4 + 3 = 8 in the tens place → final answer: 85.
Parent & Teacher Guidance
Regrouping is where a lot of students who were doing fine start making mistakes — not because addition got harder, but because there's now an extra step to remember. Watch for a child who gets the ones column right but forgets to add the regrouped ten into the tens column; that's the single most common error, and it means the regrouped digit needs to be written down (not done mentally) until it's automatic. If a child regroups correctly but consistently writes the wrong digit — putting the tens digit below instead of carrying it over — they've mixed up which digit stays and which moves, which is worth re-explaining with a concrete example like 47 + 38 rather than assigning more timed problems. Once a child can explain out loud why they're regrouping a ten (not just where to write it), they're ready to move quickly through this level.
Frequently Asked Questions
What is regrouping in addition?
Regrouping occurs when the digits in a column add up to 10 or more. You write the ones digit of the sum below that column and regroup 10 ones as 1 ten, moving it to the top of the next column to the left. For example, in 47 + 38: the ones column is 7 + 8 = 15, so write 5 in the ones place and regroup 1 ten into the tens column. Then 1 + 4 + 3 = 8 in the tens place, giving 85. This is also commonly called carrying.
What grade is 2-digit addition with regrouping?
Two-digit addition with regrouping is typically taught in Grade 2 and reinforced in Grade 3. Students should have solid fluency with single-digit addition and basic two-digit addition without regrouping before starting this level.
Why is regrouping in addition sometimes called "carrying"?
Carrying is the traditional name for the same process: when a column's sum exceeds 9, you write the ones digit and "carry" the tens digit to the next column by writing it above that column. Regrouping is the term used in modern curricula, and it describes the concept more precisely — exchanging 10 ones for 1 ten. Both terms describe the same step.
What is the difference between addition with and without regrouping?
In addition without regrouping, no column adds up to 10 or more, so every digit stays in its own column (e.g., 23 + 45 = 68). In addition with regrouping, at least one column totals 10 or more, so 10 ones must be exchanged for 1 ten and moved into the next column (e.g., 47 + 38 = 85).
Comfortable with regrouping? Try 2-digit subtraction with regrouping, the inverse skill →