Week 18 DCA Review Ratios, Proportions, Percents, and Probability Name:___________________ Date: ___________________ Period:__________________

Ratios  What is a ratio?  What are the 3 ways we can write a ratio?  Is order important in a ratio?  How do you simplify a ratio?

Proportions  What is a proportion?  How do we set up a proportion?  How do you solve a proportion?  LABEL…LABEL….LABEL!!!

Percents  How do you convert a: Percent to a fraction? Percent to a decimal? Fraction to a percent? Decimal to a percent?

Probability  What is probability?  What is sample space?  How do you make a tree diagram?  How can you find the total # of combinations?  How do you write theoretical probability?

Question 1 Brianna practices violin for 62 hours in 250 days. Which proportion could be used to find x, the number of days she practiced if she practiced for 41 hours? A.62/250 = x/41 B.62/250 = 41/x C.250/62 = 41/x D.62/x = 41/250

Question 2 Which of the following is equivalent to 3 / 20 ? A.32% B.0.15% C.0.32% D.15%

Question 3 Shanell bought a shirt on sale for $30, which was ¼ of the original cost. Which strategy will help you convert the discount to a decimal? A.Divide 4 by 1 B.Divide $30 by ¼ C.Multiply ¼ by $30 D.Divide 1 by 4

Question 4 Modern Warfare was on sale for $25, which was 50% off the original price. Which decimal represents the discount? A.0.05 B.0.25 C.0.20 D.0.50

Question 5 Charlie had 1 red marble, 1 blue marble, 1 yellow marble, and 1 green marble in a bag. He picked 2 marbles at random from the bag. Which diagram shows all the possible color combinations of the 2 marbles that Charlie picked? A.F B.G C.H D.J

Question 6 A local pet shelter has 5 cats for every 6 dogs. If there were 66 total animals, how many would you expect to be cats? A.30 cats B.55 cats C.11 cats D.24 cats

Question 7 Brittany was re decorating her room. She has 2 different bed spread to choose from, 3 different curtians to choose from and 6 different paint colors to choose from. How many different combinations does she have to choose from? A.36 B.12 C.11 D.6

Question 8 There are 3 stars for every 7 hearts. Which of the following could NOT be the combination of stars and hearts? A.28 hearts and 12 stars B.21 hearts and 9 stars C.15 hearts and 8 stars D.14 hearts and 6 stars

Question 9 There are 9 marbles in a bag and 3 of them are red. If you pick a marble at random, which expression represents the probability that you will NOT choose a red one? A.1 – 6 / 9 B.1 – 3 / 9 C / 9 D.1 – 3 / 6

Question 10 Miguel’s heart beats 5 times every 2 seconds. How many seconds does it take for his heart to beat 30 times? A.75 seconds B.10 seconds C.60 seconds D.12 seconds

Question 11 Willy Wonka was giving out special golden tickets. 4 out of every 90 chocolate bars would have a golden ticket. If there are 360 tickets, how many do you should contain the prize? A.26 B.16 C.12 D.36

Question 12 Jayla completed 4/5 of her math homework. What percent of her homework has she not completed? A.45% B.80% C.20% D.0.45%