Single variable
X+X=50
X=?
X=25
X+Y=68
X=36
Y=?
Y=32
(6+4)+(10-4)=?
16
Andy has 45 cookies (c) and he wants to share them with his 4 friends (f).
Write an expression that shows how much cookie each friend will receive?
c ÷ f = 11.25
Each friend will receive 11 cookies and a quarter
What’s the definition of variable?
A number we use in math to represent a number
Y-150=90
Y=?
Y=240
X-Y=59
Y=43
X=?
X=102
62-12=?
24
Lucy had 12 candies (c) and her mother gave her another 30 this morning.
Write an expression that shows how many candies Lucy has?
c + 30 = 42
Lucy has 42 candies.
What’s a multiple variable?
Multiple=many
Multiple variable=many variables
Y×10=100
Y=?
Y=10
X×Y=300
X=50
Y=?
Y=6
2×(2+4)÷3=?
4
Max had 112 lollipops (l) this morning then he gave his sister 34 and he gave his brother 75.
Write an expression that shows how many candies Max has right now?
l - 34 - 75 = 3
Max has 3 candies right now.
What’s a single variable?
Single=one
Single variable=one variable
X÷4=50
X=?
X=200
Y÷X=36
Y=144
X=?
X=4
((2+4)-2)×8=?
32
Andrew has 230 bags of chips (c) and he wants to share them with his 5 friends (f).
Write an expression that shows how many bag will each friend receive.
c ÷ f = 46
Each friend will receive 46 bags of chips.
What’s an equation?
a statement that the values of two mathematical expressions are equal
X4=240
X=?
X=60
X+X-Y=46
X=60
Y=?
Y=74
Why do we use BEDMAS?
To help remember an order of operations in algebra basics
Ben had 145 slices of cake (c). This morning he gave his brother 20 slices and his mother 50 slices. Grandma this afternoon made him 30 more slices.
Write an expression that shows how many slice of cake Ben has right now.
c - 20 - 50 + 30= 105
Ben has 105 slices of cake right now.
What’s an expression?
Numbers, symbols and operators (such as + and ×) grouped together that show the value of something