Adding and Subtracting 3-Digit Numbers
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Objective
I can add and subtract three-digit numbers using the standard algorithm, showing regrouping when needed.
Part 1 of 4
Warm-up video
mathantics · 6:57Vetted channel
We don't generate video — this one is by mathantics on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 4
Key concepts
3 concepts
- 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.
Part 3 of 4
Practice
3 questions
When subtracting multi-digit numbers, which number goes on top when rewriting the problem?
Explain the process of borrowing (regrouping) in subtraction. Why is it sometimes necessary, and what does it involve?
Part 4 of 4
Exit ticket
Quick comprehension check
“Solve 523 - 156 using the standard algorithm. Show your regrouping.”
Sample answer included in the free materials
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