Good morning
Today is Monday August 21st, 2023
Classroom rules
Math Class
Addition and subtraction within 20
Commutative Property
* You can add in any order.Changing the order of the addends does not change the sum.
Example: A + B = B + A 2 + 4 = 4 + 2
It's time for PRACTICE!
Practice:
5 + 9 = ___ 9 + 5 = ___ 7 + 4 = ___ 4 + 7 = ___
Practice:
Associative Properties
When you add, you can group the numbers in any combination.
Example: * A + (b + c) = c + ( a + b) * 1 + ( 3 + 4 ) = 4 + ( 1 + 3)
The parentheses mean doing before you add .
It's time for PRACTICE!
Practice:
( 77 + 2) + 3 5 + ( 8 + 7) ( 6 + 5 ) + 4 4 + ( 3 + 2 ) ( 2 + 8 ) + 1 9 + ( 3 + 5 )
Identity Properties
* The sum of any number and 0 is the same number.
Example: A + 0 = A 4 + 0 = 4
It's time for PRACTICE!
Practice:
5 + ___ = 5 3 + 0 = ___ ___ + 9 = 9 4 + ___ = 4 2 + 0 = ___ ___ + 6 = 6
Problem of the day
On Monday, Elyse put 4 coins in her empty bank. Each day after that, she put 4 coins in the bank. On Friday, after putting in 4 coins, she opened up the bank. How many coins did she find? ____
Quick Check
Find each sum. Identify the property.
1. 0 + 22 = 2. 4 + 9 = 9 + 4 = 3. 10 + ( 8 + 3 ) = 3 + (10 + 8 ) =
Identity Property of Addition
Communitative Property of Addition
Associative Property of Addition
Thanks for your attention!
Keep Practicing!
Math addition properties
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Created on September 10, 2020
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Transcript
Good morning
Today is Monday August 21st, 2023
Classroom rules
Math Class
Addition and subtraction within 20
Commutative Property
* You can add in any order.Changing the order of the addends does not change the sum.
Example: A + B = B + A 2 + 4 = 4 + 2
It's time for PRACTICE!
Practice:
5 + 9 = ___ 9 + 5 = ___ 7 + 4 = ___ 4 + 7 = ___
Practice:
Associative Properties
When you add, you can group the numbers in any combination.
Example: * A + (b + c) = c + ( a + b) * 1 + ( 3 + 4 ) = 4 + ( 1 + 3)
The parentheses mean doing before you add .
It's time for PRACTICE!
Practice:
( 77 + 2) + 3 5 + ( 8 + 7) ( 6 + 5 ) + 4 4 + ( 3 + 2 ) ( 2 + 8 ) + 1 9 + ( 3 + 5 )
Identity Properties
* The sum of any number and 0 is the same number.
Example: A + 0 = A 4 + 0 = 4
It's time for PRACTICE!
Practice:
5 + ___ = 5 3 + 0 = ___ ___ + 9 = 9 4 + ___ = 4 2 + 0 = ___ ___ + 6 = 6
Problem of the day
On Monday, Elyse put 4 coins in her empty bank. Each day after that, she put 4 coins in the bank. On Friday, after putting in 4 coins, she opened up the bank. How many coins did she find? ____
Quick Check
Find each sum. Identify the property.
1. 0 + 22 = 2. 4 + 9 = 9 + 4 = 3. 10 + ( 8 + 3 ) = 3 + (10 + 8 ) =
Identity Property of Addition
Communitative Property of Addition
Associative Property of Addition
Thanks for your attention!
Keep Practicing!