One-Step Equations

Addition (+) equations

100

a + 3 = 8

a = 5

200

x + 80 = 120

x = 40

300

h + 66= 21

h = -45

400

120 = j + 30 

j =90

500

p + (-12) = 86

p = 98

Subtraction (-) equations

100

g - 5 = 4

g = 9

200

n - 10 = 13

n = 23

300

f - 21 = 98

f = 119

400

a - 15 = -15

s = 0

500

28 = z - 48

z = 76

Vocab

100

What is the inverse (opposite) operation of addition?

Subtraction

200

Define inverse operation

The opposite, signs that undo each other

300

Things that have an effect on one another, represented in a equations by a letter.

Variable

400

Name the 4 operations

addition, subtraction, multiplication, division

500

Replacing a variable with a number value

Substitution 

Multiplication (*) equations

100

5k = 25

k = 5

200

25u = 625

u = 25

300

486 = -18c 

c = -27

400

12y = -144

y = -12

500

-8x = 56

-7 

Division equations

100

v/9 = 9

v = 81

200

t/-7 = 4

t = -28

300

-4 = y/10 

y = -40

400

i/-12 = -4

i = 48

500

-7 = b/-12 

b = 84