Solving One-Step Equations

Addition

100

x + 4 = 25

x = 25 - 4

x= 21

200

a + 13 = 10

a= 10 - 13
a = -3

300

n + (-8) = -14

n - 8 = -14
n = -14 + 8
n = -6

400

x + 36 = -100

x = -100 -36

x = -136

500

-27 = c + 27

c = -27 - 27 

c = - 54

Subtraction

100

x - 2 = 6

x = 6 + 2

x = 8

200

d - 7 = -9

d = -9 +7
d = -2

300

k - (-83) =121

k + 83 = 121
k = 121 - 83
k =38

400

x - 327 = -665

x = -665 + 327
x = -338

500

a - (-163) = -392

a +163 = -392
a = -392 -163

a = -555

Multiplication

100

9x = -27

x = -27 : 9

x= -3

200

-7x = -63

x = -63 : -7
x = 9

300

-5e = -400

e = -400 :  -5
e = 80

400

-11x = 275

x = 275 : -11
x = -25

500

-21y = -756

y = - 756 : -21
y = -36

Division

100

y/-6 = 2

y =  2 * -6 

y = -12

200

x/4 = -14

x = -14 * 4
x=  -56

300

x/6 = -6

x = -6 * 6

x =  -36

400

-28 = a/-13

a= -28 * -13

a = 364

500

-80 = x/15

x = -80 * 15
x= -1200

Decimals

100

m + 3.7 = 2.4

m =  -1.3

200

x - (-66.09) = 102.8

x = 36.71

300

-5.6 = 0.8x

x = -5.6 : 0.8

x= -7

400

c/-0.29 = 5.5

c = 5.5 * (-0.29)
c =-1.595

500

0.12 = y/0.12

y = 0.12 * 0.12 

y = 0.0144