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Learn how to describe probability using fractions with examples of selecting red, blue, or green marbles from a bag and beads for a beaded belt. Practice determining probabilities and outcomes with illustrations. Improve your math skills!

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  1. Splash Screen

  2. Five-Minute Check (over Lesson 15–1) Main Idea and Vocabulary Key Concept: Probability Example 1: Use Fractions to Describe Probability Example 2: Real-World Example Make a Prediction Lesson Menu

  3. I will use fractions to describe probability. • favorable outcome Main Idea/Vocabulary

  4. KC

  5. Use Fractions to Describe Probability One marble is chosen from the bag. Find the probability that a red marble is chosen. Example 1

  6. number of red marbles total number of marbles Answer: So, the probability of choosing a red marble is . 3 8 3 8 Use Fractions to Describe Probability number of favorable outcomes P(event) = number of possible outcomes 6 P(red) = 16 Simplify. P(red) = Example 1

  7. A B C D 3 A. 8 1 B. 8 1 C. 2 4 D. 16 One marble is chosen from the bag. Find the probability that a blue marble is chosen. Example 1

  8. Jamal is making a beaded belt. Each packet of beads comes in the colors shown in the table. If Jamal takes one bead without looking, what is the probability that he gets a blue or green bead? There are 12 + 18 + 24 + 6 or 60 beads in all. There are 18 + 24 or 42 beads that are either blue or green. Example 2

  9. blue or green beads total number of beads 42 60 7 10 Answer: So, the probability that Jamal will get a blue or green bead is . 7 10 number of favorable outcomes P(event) = number of possible outcomes 18 + 24 P(blue or green) = 12 + 18 + 24 + 6 = Add. Simplify. = Example 2

  10. A B C D 3 A. 8 5 B. 8 1 C. 8 3 D. 10 Looking at the chart below, what is the probability of picking a red or a yellow bead at random? Example 2

  11. End of the Lesson End Lesson

  12. Five-Minute Check (over Lesson 15–1) Image Bank Math Tool Chest Make a Prediction Resources

  13. A B C D E (over Lesson 15–1) One card is drawn without looking. Describe the probability of drawing an even number rather than an odd number. • impossible • likely • equally likely • unlikely • certain Five Minute Check 1

  14. A B C D E (over Lesson 15–1) One card is drawn without looking. Describe the probability of drawing 5 rather than 8. • impossible • likely • equally likely • unlikely • certain Five Minute Check 2

  15. A B C D E (over Lesson 15–1) One card is drawn without looking. Describe the probability of drawing 2 rather than 7. • impossible • likely • equally likely • unlikely • certain Five Minute Check 3

  16. A B C D E (over Lesson 15–1) One card is drawn without looking. Describe the probability of drawing 9. • impossible • likely • equally likely • unlikely • certain Five Minute Check 4

  17. A B C D E (over Lesson 15–1) One card is drawn without looking. Describe the probability of drawing an even or an odd number. • impossible • likely • equally likely • unlikely • certain Five Minute Check 5

  18. End of Custom Shows

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