Adding and Subtracting 3-Digit Numbers
4th Grade · Math · 25 min
Lesson Preview
Learning Objective
I can add and subtract three-digit numbers using the standard algorithm, showing regrouping when needed.
- 1
When rewriting a multi-digit subtraction problem, the number you are taking from goes on top, and the number you are taking away goes on the bottom.
- 2
When subtracting, always start with the ones place column, and if the top digit is smaller than the bottom digit, you need to borrow.
- 3
If you need to borrow from a digit that is zero, you have to borrow from the next two digits instead of just one.
