3G 3-Digit Addition Regrouping Lesson

​What is Regrouping?

​In math, regrouping is making groups of tens when adding or subtracting two-digit numbers or larger numbers.

1. First place the numbers according to the place value starting from ones place.

2. Arrange the two 3-digit addends in order and add the numbers vertically.

3. Add the numbers in the ones place if the result is more than 10,

carry the tens place value to the next place value.

4. Add the numbers in the tens place and also add the carried value and write the result.

5. If the result is greater than 10 carry the digit to hundreds place value.

6. Add the numbers in the hundreds place and also add the carried value and write the result. This number is the sum.​

​ Steps to add 3-digit numbers with regrouping.

​

​Click on the play button below to learn how to Add 3-Digits with Regrouping.

Multiple Choice

Calculate the sum.

• 482

• 481

• 582

• 581

Multiple Choice

Calculate the sum.

• 550

• 505

• 605

• 600

Multiple Choice

Calculate the sum.

• 1,108

• 1,118

• 1,180

• 1,000

Multiple Choice

a statement that shows that 2 expressions are equal to one another, separated by an equal sign.

• minuend

• equation

• partial sums

• inverse operations

Properties of Addition

1. Identity Properties

2. Commutative Properties

3. Associative Properties

Commutative vs Identity Properties

https://www.youtube.com/watch?v=njfx1sDb45Y

Multiple Choice

What property does the below equation show?

$$4\ +\ 0\ =\ 4$$  

• Commutative Property

• Identity Property

Multiple Choice

What property does the below equation show?

$$0\ +\ 7=\ 7$$  

• Commutative Property

• Identity Property

Multiple Choice

What property does the below equation show?

$$4\ +3\ =\ 3\ +\ 4$$  

• Commutative Property

• Identity Property

Multiple Choice

Which property of addition does the equation show?

$$\left(4\ +2\ \right)\ +\ 2\ =\ \left(2\ +2\right)\ +\ 4$$  

• Commutative Property

• Identity Property

• Associative Property

Let's recap

Identity >> 0

Commutative >> order 

Associative >> brackets