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Operation
Inverse Operation
Operation/Solve
Operation/Inverse
Operation/Inverse/Solve
100

+

Add

100

-

+ 

100

x + 5 = 10

Add

x = 5 

100

x + 2= 8 

Operation: Add

Inverse: Subtract

100

x - 4 = 6 

Operation: Subtract 

Inverse: Add

Answer: x = 10

200

-

Subtract 
200

Multiply 

Divide 

200

x - 4 = 10


Subtract

x = 14


200

x - 10 = 10

Operation: Subtract 

Inverse: Add

200

2x - 5 = 5 

Operation: Multiply, Subtract 

Inverse: Divide, Add

Answer: x = 5 

300

x

Multiply 


300

Addition

Subtraction 


300

3x = 12

Multiply 

x = 4


300

2x = 10 

Operation: Multiply 

Inverse: Divide 

300

3x = 21

Operation: Multiply  

Inverse: Divide 

Answer: x = 7

400

/ 

Divide

400

/

x

400

x/4 = 4 

Divide 

x = 16


400

x/4 = 8 

Operation: Divide

Inverse: Multiply 

400

x / 4 = 8 

Operation: Divide

Inverse: Multiply 

Answer: x = 32

500

6 + 3 - 2 

Add, Subtract 


500

4/2

Multiply 2

500

2x = 10 

Multiply 

x = 5 

500

6x = 24 

Operation: Multiply 

Inverse: Divide

500

20 = x - 5 

Operation: Subtract 

Inverse: Add

Answer: x = 25