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Operation
Inverse Operation
Surprise
One-Step
Two-Step
100

4 + 6 = 10 

Add


100

x + 100 = 225 

Subtraction

100

4(x + 2) = 16 

x = 2

100

x - 10 = 50 

x = 40

100

5x + 5 = 20 

x = 3

200

10 - 5 = 5 

Subtract

200

x - 50 = 10 

Add 
200

2x + 5x + 4 - 2 + 1 

7x + 3 

200

x/5 = 5 

x = 25

200

3x - 3 = 9 

x = 4

300

10x = 40 

Multiply

300

x/2 = 12 

Multiply

300

2x(5 + 4) - 10 = 26

x = 2 

300

3x = 27 

x = 9 

300

x/4 + 2 = 18

x = 64

400

3x + 5 = 14 

Multiply and Add

400

3x = 12

Divide

400

4x + 3xy + 2 + 6x + 7xy - 2 

10x + 10xy 

400

x + 14 = 28

x = 14

400

x/10 + 20 = 100

x = 800

500

x/14 - 2 = 12 

Divide and Subtract 

500

82 + x = 100

Subtracting 

500

10 + 4 - 3x + 2x + 7 + 8y 

-x + 8y + 21

500

2x = 100 

x = 50

500

7x + 2 = 51

x = 7