Probability
Equations
Fraction, Decimal,& %
Cross Multiplication
Simplify
100

What's the probability of landing on heads when you flip a coin? ***Fraction only

1/2

100

x + 8 = 20

x = 12

100

Write 3/4 as a decimal

0.75

100

  2       =       4 

-----            ------

10                  x

x = 20

100

Simplify 4/8

1/2

200

What's the probability of choosing a month out of the year that starts with J? ***Fraction only

3/12 OR 1/4

200

x + 15 = 30

x = 15

200

Write 0.25 as a percent

25%

200

  3       =        6

------          ------

2                   x


x = 4

200

Simplify 10/50

1/5

300

What are the two types of probability?

Experimental & Theoretical

300

5x = 25

x = 5

300

Write 1/5 as a decimal

0.2 

300

  5        =         10

-----               -----

10                    x

x = 20

300

Simplify 4/12

1/3

400

Dean Privott has a stack full of 25 referrals. 4 of them belong to Unique, 6 of them belong to Mikayla, 5 of them belong to Eyanna, and 10 of them belong to Dennis. What's the probability of choosing a referral belonging to Mikayla? *** Fraction & percent. 

6/25       24%     

400

50x = 150

x = 3

400

Write 1/4 as a decimal & percent

0.25 and 25%

400

 8        =          4

-----               -----

 6                     x

x = 3

400

Simplify 6/24

1/4

500

What's the probability of rolling a number less than 5 on a dice? *** Fraction, decimal, & percent

4/6    0.66     66%   

500

3x - 12 = 18

x = 10

500

Write 4/6 as a decimal and percent

0.66 and 66%

500

 15       =       9

------            ------

12                   x

x = 7.2

500

Simplify 100/1000

1/10