Addition
w + 5 = 8
w = 3
x - 8 = 10
x = 18
2x = 10
x = 5
x/2 = 4
x = 8
What's the inverse of addition?
Subtraction
8 + y = 20
y = 12
7 = y - 7
y = 14
75 = 25m
m = 3
5 = x/3
x = 15
What are zero pairs?
Two numbers that cancel out to zero
(4 + 3) + w = 17
w = 10
-6 = x - 6
x = 0
45 = 3h
h = 15
x/3 = 16
x= 48
What is a variable?
A letter that represents an unknown number
y + 4 = 1
y = -3
x - 9 = -5
2x = 7
x = 3.5
x/2 = 0.5
x = 1
What are exponents?
y + 8 = 4
y = -4
2.45 = w - 2.55
x = 5
4w = 10
w = 2.5
x/3 = 0.25
x = 0.75
Explain what is happening when subtracting a negative: example: 2 -(-3)
adding the opposite
turning to move left on a number line and then walking backward
add zero pairs and then take away the negatives and you're left with positives