Adding and Subtracting with Regrouping

When numbers get big, you sometimes need to carry or borrow. This is called regrouping.

Steps

1. Add or subtract the ones.
2. Regroup if the sum or difference is 10 or more.
3. Move to the tens place, then the hundreds.

Practice Makes Perfect

Using vertical form helps keep your work neat and accurate.

Real-World Use

You might use three-digit addition and subtraction to total points in a sports game or keep track of big collections.