📚 Topic Summary
Probability is the chance of something happening. We can express this chance in several ways: as a fraction, a decimal, or a percentage. A fraction represents the ratio of favorable outcomes to total possible outcomes. A decimal is a fraction converted to base-10 form. A percentage is a way of expressing a number as a fraction of 100. Understanding how to convert between these forms is key to solving probability problems!
🔤 Part A: Vocabulary
Match the term with its definition.
| Term |
Definition |
| 1. Probability |
a. A number between 0 and 1 that expresses the likelihood of an event |
| 2. Fraction |
b. A way to express a part of a whole, written as one number over another |
| 3. Decimal |
c. A fraction whose denominator is a power of ten, expressed using a decimal point |
| 4. Percentage |
d. A rate, number, or amount in each hundred |
| 5. Outcome |
e. A possible result of an experiment or event |
✍🏽 Part B: Fill in the Blanks
Complete the following paragraph using the words provided: likely, impossible, certain, 0, 1, fraction, percentage, decimal.
Probability is a measure of how ________ an event is to occur. It is always a number between ________ and ________. We can express probability as a ________, ________, or ________. An event that is ________ to happen has a probability of ________, while an event that is ________ has a probability of ________.
🤔 Part C: Critical Thinking
A bag contains 3 red marbles, 2 blue marbles, and 5 green marbles. If you pick one marble without looking, what is the probability of picking a blue marble? Express your answer as a fraction, a decimal, and a percentage. Show your work.