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Miscellaneous
Multiplication & Addition
Multiplication & Subtraction
Division & Addition
Division & Subtraction
100

A letter used to represent an unknown number

variable

100

2k + 5 = 17

k = 6

100

3a - 5 = 4

a = 3 

100

m/5 + 4 = 6

m = 10

100

z/6 - 8 = 2

z = 60

200

The inverse operation of addition

subtraction

200

2a + 11 = 35

a = 12

200

5m - 7 = 23

m = 6

200

y/8 + 11 = 13

y = 16

200

y/4 - 5 = 5

y = 40

300

The inverse operation of multiplication. 

division

300

2r + 39 = 65

r = 13

300

6k - 5 = 43

k = 8

300

k/3 + 6 = 12

k = 18

300

z/6 - 4 = 3

z = 42

400

The four basic mathematical operations

addition, subtraction, multiplication, and division

400

-2s + 7 = 11

s = -2

400

-4j - 2 = 14

j = -4

400

g/11 + 37 = 128

g = 1001

400

y/3 - 18 = -6

y = 36

500

A number in front of a variable. 

coefficient

500

-b + 14 = 4

b = 10

500

-2q - 3 = -1 

q = -1

500

w/10 + 5 = 65

w = 600

500

d/10 - 84 = -64

d = 200