2-Digit Addition with Carrying Practice
Practice regrouping when ones digits add to 10 or more, then carry to the tens column to build confidence with advanced two-digit addition.
What You'll Practice
- ✓ Two-digit addition problems where the ones column always sums to 10 or more
- ✓ Carrying (regrouping) 1 from the ones column to the tens column
- ✓ Problems range from 15–99 + 15–99 to ensure every problem requires a carry
- ✓ Instant feedback on every answer with streak and score tracking
How to Do Addition with Carrying
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 Carry
Add the ones column. If the sum is 10 or more, write the ones digit below and place a small "1" above the tens column. Example: 7 + 8 = 15 → write 5, carry 1.
Add the Tens + Carry
Add the tens column digits plus the carried 1. Write the result. Example: carried 1 + 4 + 3 = 8 in the tens place → final answer: 85.
Frequently Asked Questions
What is carrying in addition?
Carrying (also called 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 "carry" the tens digit 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 carry 1 to the tens column. Then 1 + 4 + 3 = 8 in the tens place, giving 85.
What grade is 2-digit addition with carrying?
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 carrying before starting regrouping.
Why is it called "carrying" in addition?
The term "carrying" comes from the physical action in written arithmetic: 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. The modern math curriculum often uses "regrouping" instead, which describes the concept more precisely (exchanging 10 ones for 1 ten).
What is the difference between carrying and regrouping?
Carrying and regrouping refer to the same process in addition. "Carrying" is the traditional term for the written shorthand used in column addition. "Regrouping" is the conceptual term used in modern curricula, emphasizing that 10 ones are exchanged for 1 ten. Both describe the same step.