Adding 3-digit Numbers With Regrouping
Concept
The addition is a process of adding two or more items together. In math, addition is the method of calculating the total of two or more numbers to know the sum of the numbers. It is a primary arithmetic operation.
The addition that involves the sum of digits greater than 9 at any of the place values is called addition with regrouping. To add two numbers with regrouping, we find the sum of the digits and then write only the unit place digit in the respective column, while taking the tens place digit with the column to the immediate left.
Rules
1. Place the addends one on top of the other so that the place values fall in the same columns.
2. Add each column together separately, starting with the one’s place. Write only the unit place digit in the respective column, while taking the tens place digit with the column to the immediate left. The sums go below each column, underneath the line.
Example
Add.
527 + 184
Solution
1. Place the addends one on top of the other so that the place values fall in the same columns.
2. Add each column together separately, starting with the one’s place. Write only the unit place digit in the respective column, while taking the tens place digit with the column to the immediate left. The sums go below each column, underneath the line.
Practice Adding 3-digit Numbers With Regrouping
Practice Problem 1
Add.
Use the model. Click on ones to regroup them to make a ten and then add.
Practice Problem 2
Add.
Use the model. Click on ones or tens to regroup them to make a ten or hundred and then add.
Practice Problem 3
Add.
Use the model. Click on ones or tens to regroup them to make a ten or hundred and then add.
Addition – a mathematical operation in which two or more numbers are combined to equal a greater number.
Addend – a number which is added to another.
Sum – Final answer of the addition.
Regrouping is the process of making groups of tens when adding or subtracting two digit numbers (or more) and is another name for carrying and borrowing.
Pre-requisite Skills
Addition strategy – Count on using counters
Add Using Number Lines
Near Doubles
Addition strategy – Make 10
Add three numbers
Add tens
Add tens and ones – Count on
Add 2 digits and 1 or 2 digits number – without regrouping
Regroup ones as tens
Add a two-digit and a one-digit numbers with regrouping
Add 2 two-digit numbers with regrouping