Adding One-step Equations

Addition

100

x-20=50

x=70

200

x-100=700

x=800

300

x-20=78

x=98

400

x-1000=47

x=1047

500

x-200.5=300.5

x=501

Subtraction

100

x+20=50

x=30

200

x+58=147

x=89

300

x+99=10

x=-89

400

x+88.5=100.5

x=12

500

x+3000=12549

x=9549

Multiplication

100

2/3x=4

x=6

200

4/8x=100

x=200

300

3/1x=99

x=33

400

7/6x=42

x=36

500

5/10x=100

x=200

Division

100

5x=15

x=3

200

100x=5000

x=50

300

25x=250

x=10

400

300x=2100

x=7

500

8x=40,000

x=5000

Mystery!

100

Must check this equation.

In this equation below, does x=10?

80x=800

Yes!

200

What is the answer to this equation?

10/90x=10

x=90

300

Solve the equation below.

x-9.75=10.25

x=20

400

What is the answer to this question:

x+75.1=100

x=24.9

500

Is the variable an answer to the equation?

X=25

x-25=118

No, X=143