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# Math Properties

By Melissa Ignacio & GeAnn Santos
by

## GeAnn Santos

on 19 September 2013

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#### Transcript of Math Properties

Inverse Property of Multiplication
Numerical Expression: 2* 1/2=1
Algebraic Expression: a*1/a=1

Shortcut: States that every non-zero number "a", when multiplied by "1/a",
gives the 1 as the answer.
Algebraic Properties
By: Melissa Ignacio & GeAnn Santos
Block: 2

Numerical Expression: 1-1=0 or -1+1=0
Algebraic Expression: a-a=0 or -a+a=0

Shortcut: If you add a number and it's negative number together, or subtract a number from an identical one, this property is being implied.
Distributive Property
Numerical Expression: 1(2+3)= 1(2)+1(3)
Algebraic Expression: a(b+c)= a(b)+a(c)

Shortcut: A property that indicates a special way in which multiplication is applied to addition with two or more numbers.
Numerical Expression: 2*1=2
Algebraic Expression: a*1=a

Shortcut: States that the product of 1 and any number or variable is the number or variable itself.
Identity Property of Multiplication
Property of Zero
Numerical Expression: 1+0=1
Algebraic Expression: a*0=0

Shortcut: The sum of any number and zero is that number. The product of any number and zero is zero.
Numerical Expression: (1+2)+3= 1 +(2+3)
Algebraic Expression: (a+b)+c= a+(b+c)

Shortcut: When two or more numbers are added, the sum is the same regardless of the order of addition.
The algebraic properties in mathematics explained in depth.
Numerical Expression: 1+2= 2+1
Algebraic Expression: a+b= b+a

Shortcut: Even with changing the order of the factors, it does not change the ending result.

Associative Property of Multiplication
Numerical Expression: (1*2)*3= 1*(2*3)
Algebraic Expression: (a*b)*c= a*(b*c)

Shortcut: The multiplication of a set of numbers is the same regardless of how the numbers are grouped.
Commutative Property of Multiplication
Numerical Expression: 1*2= 2*1
Algebraic Expression: a*b= b*a

Shortcut: With changing the order of both factors, the product would still have the same ending result.
Need some help learning it?
Keyword:
social
-Think of the numbers as amounts of people. They can socialize with anyone they want in the group, yet there are still the same amount of people in the group.
Practice:

2 + (1 + 3) = ?

2 + (1 + 3) = (2 + 1) + 3
Numerical Expression: 1+0=1
Algebraic Expression: a+0=a

Shortcut: States that the sum of any number or variable and zerio is the number or variable itself.
Thank you for watching and listening to our presentation
Start
Stop
Learning in Depth
Keyword:
social
Socializing with the same amount
of people
Practice:

3 * (4 * 2) = ?

3 * (4 * 2) = (3 * 4) * 2
Try It Out
Keyword:
Commute
Think of a car, you can sit anywhere in the car, yet there are still the same amount of people in the car.

Practice

4 + 5 + 2 = ?

4 + 5 + 2 = 2 + 4 + 5
Need help learning it?
Keyword:
Commute- to travel
Think of the numbers as amounts of guests bringing friends with them to a party. If everyone brings 2 friends, it won't matter who you meet first, you will meet the same amount of people in the end.
Practice

3 * 2 * 4 = ?

3 * 2 * 4 = 2 * 4 * 3
Keyword:
Invert, reverse
Think of this property as a way of
reversing the number to turn
back into zero.
Practice

-5 + 5 = ?

-5 + 5 = 0
Reversing -5 to become 0
5 cancles out -5 to become 0
Need help?
Keyword:
Invert, reverse
Say you cut up 8 cookies each into
as"1/8". If you put back together
8 of the pieces, you end up with
Practice

4 * 1/4 = ?

4 * 1/4 = 1
Going into Depth
Keyword:
Distribute
Think of having to buy a number of cookies to give to a number of people. Instead of counting them all at once, you can divide them into groups to make it easier to determine how many cookies you need to buy.

Practice

2 * (4 + 2) = ?

2 * (4 + 2) = 2(4)+2(2)
Understanding the Concept Better
Keyword:
Identity
Think of this property as trying to not change the identity of someone or something by choosing to not add anything when you are asked to do so.
Practice

2 + 0 = ?

2 + 0 = 2
Need some help?
Keyword:
Identiy
Let's say you made 10 cookies. It doesn't matter if for every 2 friends you give 5 cookies or every 5 friends 2 cookies, you are still giving 10 cookies away.
Practice

140 * 1 = ?

140 * 1 = 140
Does not affect 140
Keyword:
zero
Adding zero to a number will not change it in anyway. Multiplying a number by zero will change the value to become zero itself.
Practice

3 * 0 = ? 4 + 0 = ?

3 * 0 = 0 4 + 0 = 4
Full transcript