REGROUPING
Definition Of Regrouping
Regrouping is reorganizing the formation of the group
More about Regrouping
Regrouping is used to assist while performing addition and subtraction
Example of Regrouping
Subtract 9 from 25.
To subtract 9 from 25, we first arrange the blocks and then divide one of the tens blocks in ten unit blocks
Video Examples: Regrouping Whole Numbers
The filled blocks are 9 as they are to be subtracted.
When subtracted 9 from 25 we are left with 16. That is,
Solved Example on Solved Example on Regrouping
Ques: Mathew collected 120 postal stamps. He gave 13 to his friend. How many stamps was he left with?
Choices:
A. 97
B. 117
C. 87
D. 107
Correct Answer: D
Solution:
Step 1: Number of stamps Mathew collected = 120
Step 2: Number of stamps Mathew gave to his friend = 13
Step 3: Number of stamps left = Number of stamps collected - Number of stamps given to his friend
Step 4: Therefore, Mathew was left with 107 stamps.
Quick Summary
- Regrouping helps in subtracting when the digit being subtracted is larger than the digit it's being subtracted from.
- Regrouping involves borrowing from the next higher place value (e.g., borrowing from the tens place to add to the ones place).
🍎 Teacher Insights
Use visual aids like base-ten blocks to demonstrate the concept of regrouping. Emphasize the importance of place value understanding.🎓 Prerequisites
- Place Value
- Basic Addition
- Basic Subtraction
Check Your Knowledge
Q1: What is 25 - 9 after regrouping?
Q2: Mathew collected 120 postal stamps. He gave 13 to his friend. How many stamps was he left with?
Frequently Asked Questions
Q: When do I need to regroup?
A: You need to regroup when the digit you are subtracting is larger than the digit you are subtracting from, or when the sum of digits in a place value is greater than 9.
Q: What does it mean to borrow?
A: Borrowing means taking a value from the next higher place value and adding it to the current place value to make subtraction possible.