Day 6 of 30
Subtract 3-4 digit numbers with regrouping
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Learning Objective
Students will be able to subtract 3-4 digit numbers with regrouping.
In this lesson, we'll explore how to subtract 3-4 digit numbers with regrouping. Mathematical thinking develops logical reasoning and problem-solving abilities.
Regrouping (also called carrying or borrowing) means exchanging one place value for another when adding or subtracting. When adding: If a column sum is 10 or more, regroup by moving the extra to the next column (e.g., 15 ones = 1 ten and 5 ones). When subtracting: If you don't have enough in a place, borrow from the next column (e.g., 1 ten = 10 ones). Regrouping lets you add and subtract any numbers!
As you work through today's material, pay attention to the examples and try to identify the patterns or strategies being used. This will help you apply these concepts to new problems.
Take notes on key points and make connections to what you've already learned in previous lessons.
A mathematical question requiring analysis and solution
The result obtained by solving a problem
Instructions
Materials Needed
- Notebook
- Calculator (if needed)
- Graph paper
Add with regrouping: 47 + 36
Subtract with regrouping: 52 - 28
Solve: 245 + 387
Teaching Tip
For this age group: Balance direct instruction with collaborative activities. Allow students to explain their thinking and make connections to prior knowledge when exploring subtract 3-4 digit numbers with regrouping.