Solving One-Step Equations

Addition

100

Solve: x + 4 = 25 

    x+4 = 25

x +4-4 = 25-4

        x = 21

200

Solve:  x + 36 = -100 

      x + 36 = -100

x + 36 -36 = -100 -36

              x = -136

300

Solve: n + -8 = -14 ?

    n + -8 = -14

      n - 8 = -14

  n -8 +8 = -14+8

            n=-6

400

Solve: 13 + a =10

      13 + a = 10

13 + a -13 = 10 -13

              a = -3

500

Solve:  c + 27 = 27

      c + 27 = 27

c + 27 -27 = 27 -27

              c = 0

Subtraction

100

Solve:  x - 2 = 6

     x-2 = 6

x-2 +2 = 6 +2

        x = 8

200

Solve:  d - 7 = -9

    d - 7 = -9

d - 7+7 = -9+7

         d =-2

300

Solve:  k - (-80) =120

   k - (-80) = 120 

     k + 80  = 120

k +80 -80  = 120 -80

               k=40

400

Solve: -66 = x - 32

       -66 = x - 32

-66 +32 = x - 32 +32

       -34 = x

500

Solve:  a - 4 = -4

     a - 4 = -4

a - 4 +4 = -4 +4

          a = 0

Multiplication

100

Solve:  9x = -27

     9x = -27

 9/9 x = -27/9

      x = -3

200

Solve:  -7x = -63

     -7x = -63

-7/-7 x = -63/-7

        x = 9

300

Solve:  -400 = -5e

    -400 = -5e

-400/-5 = -5/-5 e

         80=e

400

Solve:  -1x = 275

     -1x = 275

-1/-1 x = 275/-1

          x=-275

500

Solve: -y = -70

       -y = -70

   -y/-1 = -70/-1

         y = 70

Division

100

Solve:  y/-6 = 2

       y/-6 = 2

(y/-6).-6 = 2.-6 

            y = -12

200

Solve: x/4 = -10

      x/4 = -10

(x/4).4 = -10.(4)

         x = -40

300

Solve: 1/6 x = -6

      1/6 x = -6

6.(1/6) x = 6.-6

            x = -36

400

Solve:  -1/2 a = -8

       -1/2 a = -8

-2.(-1/2) a = -8.-2

               a=16

500

Solve:   x/15 = 1

       x/15 = 1

15.(x/15) = 15.(1)

            x = 15