Mixed Math Review

Math 1

100

-3x = 21

x = -7

200

2y = 40

y = 20

300

-5w = -35

w = 7

400

-30 = 6x

x = -5

500

16 = 4v

v = 4

Math 2

100

w/4 = -6

w = -24

200

x/7 = 10

x= 70

300

y/5 = -2

y = -10

400

-5 = w/9

w = -45

500

w/9 = -4

w = -36

Math 3

100

2.5 + k = 10.8

k = 8.3

200

4.5 + k = 15.8

k = 11.3

300

y - 13 = -20

y = -7

400

-1.1 + v = 1.5

v = 2.6

500

-10.1 + v = 20.5

v = 30.6

Math 4

100

-4 x -12 =

48

200

(-2) + (-4) =

-6

300

-6 – (-5) =

-1

400

144 ÷ (-12) =

-12

500

-5 x (-7) =

35

Math 5

100

What inverse operation needs to be used?

-5 + x = 45

Addition

200

Is this correct?

y - 20 = 50

   +20   +20

y= 30

Wrong, correct answer is 

y = 70

300

Is this correct?

x - 29 = 14

x= 43

Yes, 

x = 43

400

84.2 + y = 133.4

y = 49.2

500

y - 20.5 = 5.5

y = 26