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Inverse operation
Ratio
Variable
Percent
Sales tax , Markup , Tip , Discount
100
inverse operation of 2+4=6
6-4=2
100
What is the Ratio for 21 to 3
21:3
100
3b=6

B=

2
100

% of 95 = 76

80%
100

The original price of a model solar system is $60. How much will Chad pay if he buys it during the sale?

$15
200
What is the inverse operation of 2 x 4 =8
8 % 4 =2
200

There are 18 students sitting on the bleachers and 18 students sitting on the floor. What is the ratio of the number of students sitting on the bleachers to the number of students sitting on the floor?

18:18
200

h = 9 ÷ 3

H= 

3
200

% of 16 = 12

75%
200

Tracy buys a rolling pin during the sale. If the original price was $8, how much does Tracy pay?

50%OFF

$4
300
what is the inverse operation for 42 divided by 6 = 7
7 x 6 =42
300

In Becky's rose garden, 3 of the rose bushes are blooming and the other 8 rose bushes are not blooming. What is the ratio of the number of bushes that are not blooming to the number of bushes that are blooming?


8:3
300

w = 3 · 1

w=

3
300

20% of

 = 20

100
300

A store pays$99 for a microwave and marks the price up by 30% . What is the amount of the mark-up?

29.70
400
inverse operation for 120 divided by 10 = 12
12 x 10=120
400

There are 22 gold coins and 20 silver coins in Jeff's coin collection. What is the ratio of the number of gold coins to the number of silver coins?


22:20
400

2 = n ÷ 3

n=

6
400

% of 90 = 81

90%
400

Anne would like to buy a coat with an original price of $56.00. Which coupon should she use?

30 % off or 15.00 % off 

30 % off 
500
inverse operation for 6 x 3=18
18 divided by 3=6
500

In a telephone poll, 27 people said they like watching basketball and 5 people said they do not like watching basketball. What is the ratio of the number of people who like watching basketball to the number of people who do not like watching basketball?

27:5
500

k − 4 = 4

k=

8
500

$1 is what percent of $4

25%
500

The original price of an oil painting is $90. What is the sale price?

$54