Assign Probabilities
Match Probability Words to Numbers
Draw a line to match each probability word to its number.
Write the Probability (Fractions)
Write the probability as a fraction.
Rolling a 3 on a standard die: ___
Flipping heads on a coin: ___
Drawing a red card from a deck (26/52): ___
Rolling an even number on a die: ___
More Probability Fractions
Write the probability as a fraction.
Rolling a number > 4 on a die: ___
Drawing a heart from a deck (13/52): ___
Rolling a 7 on a standard die: ___
Landing on any number on a die: ___
Probability Quick Check
Circle the correct probability.
P(heads on a coin) = ?
P(rolling a 5 on a die) = ?
P(rain on a sunny day) is closest to:
P(sun rises tomorrow) is closest to:
Sort: Impossible to Certain
Sort each event by likelihood.
Probability Number Line
Explain what each probability means.
P = 0 means: ___
P = 1/2 means: ___
P = 1 means: ___
Where would P = 1/4 go? ___
Match Fractions, Decimals & Percentages
Match each probability in its three forms.
Convert Probabilities
Write each probability as fraction, decimal AND percentage.
5 red out of 20. P(red) = ___ = ___ = ___%
3 blue out of 8. P(blue) = ___ = ___ = ___%
2 green out of 10. P(green) = ___ = ___ = ___%
More Conversions
Convert each probability to all three forms.
P = 1/8. Decimal: ___. Percentage: ___%
P = 0.6. Fraction: ___. Percentage: ___%
P = 40%. Fraction: ___. Decimal: ___
P = 3/10. Decimal: ___. Percentage: ___%
Spinner Probabilities
Spinner has 8 sections: 3 red, 2 blue, 2 green, 1 yellow.
P(red) = ___ = ___ = ___%
P(blue) = ___ = ___ = ___%
P(yellow) = ___ = ___ = ___%
P(not red) = ___ = ___ = ___%
Complementary Events
P(not happening) = 1 − P(happening).
P(rain) = 0.3. P(no rain) = ?
P(win) = 1/4. P(not win) = ?
P(heads) = 50%. P(tails) = ?
Compare Probabilities
Circle the more likely event.
More likely?
More likely?
More likely?
More likely?
Probability Problems
Solve each problem.
Bag: 3 red, 5 blue, 2 green. P(blue) = ___ (all 3 forms)
Spinner 1–8. P(number > 5) = ___
Bag: 4 red, 6 blue. Add 2 red. P(red) now = ___
Probability Reasoning
Explain your thinking.
If P(event) = 0, what does that tell you? ___
If P(event) = 1, what does that tell you? ___
Can a probability be greater than 1? ___
Home Activity: Probability Games
Explore probability at home!
- 1Flip a coin 20 times. What fraction were heads?
- 2Put coloured counters in a bag. Predict then test.
- 3Roll a die 30 times. Compare fraction of 6s to 1/6.
- 4Design a spinner: blue 50%, red 25%, green 25%.
- 5Play a card game and calculate probabilities.
Expressing Probability Three Ways
Express each probability as a fraction, decimal and percentage.
Rolling a 5 on a fair die: ___ / ___ / ___
Drawing a red card from a standard deck: ___ / ___ / ___
Landing on blue (3 of 8 sections): ___ / ___ / ___
Drawing a vowel from A, E, I, O, U, B, C: ___ / ___ / ___
Match Probability to Event
Match each event to its most likely probability.
Probability Experiment Results
A spinner has red, blue, green, yellow (equal sections). Spun 80 times. Each circle = 5 spins. Answer the questions.
| Red | |
| Blue | |
| Green | |
| Yellow |
How many times was blue spun?
Expected per colour (80 spins, 4 equal sections)?
Which colour matched expected exactly?
Colour Counter Experiment
Record probability experiment results — 20 draws with replacement.
| Item | Tally | Total |
|---|---|---|
Red | ||
Blue | ||
Green | ||
Yellow |
Complementary Probability
Calculate the probability of the complement.
P(rain tomorrow) = 0.3. P(no rain) = ___
P(rolling a 6) = 1/6. P(not rolling a 6) = ___
P(drawing a heart) = 1/4. P(not a heart) = ___
Explain the complementary rule in your own words: ___
Probability on the Scale
Circle where each event sits on the probability scale 0–1.
Drawing a prime from 1–10:
Rolling less than 4 on a die:
Getting a tail on a fair coin:
Choosing a consonant from B,C,D,E,F:
Sample Space
List the sample space and calculate probability.
Fair coin flipped twice. All outcomes: ___
P(2 heads) = ___
P(at least 1 tail) = ___
A die rolled. P(even) = ___, P(prime) = ___
Sort Probabilities Lowest to Highest
Write these in order from least likely to most likely.
Probability from a Table
A bag has: 5 red, 3 blue, 2 green, 10 total. Answer the questions.
P(red) = ___
P(blue) = ___
P(not green) = ___
P(red or blue) = ___
How many red balls to make P(red) = 1/2? ___
Probability Pairs Sum to 1
Complete each pair. Probabilities of all outcomes must sum to 1.
Design a Probability Game
Design a spinner game for two players.
Sections on your spinner (colours and sizes): ___
P(Player 1 wins per spin) = ___
P(Player 2 wins per spin) = ___
Is your game fair? How do you know? ___
Probability Calculation Steps
Put these steps in order for calculating probability.
Theoretical vs Experimental
You roll a die 60 times. You get six 1s.
Theoretical P(1) = ___
Experimental P(1) from your results = ___
Are they the same? Why or why not? ___
How could you get closer to theoretical? ___
Match Fraction, Decimal, Percentage
Match equivalent probabilities.
Real-World Probability
Answer each real-world probability question.
Weather forecast: 70% chance of rain. P(no rain) = ___
1 in 6 chance of winning a prize. P(winning) as decimal = ___
10% chance of server error. In 200 requests, expected errors = ___
Identify the Correct Probability
Circle the correct answer.
P(rolling > 4) on die:
P(ace) from deck of 52:
P(sum = 7) rolling 2 dice:
P(drawing even from 1–10):
Probability and Fairness
Evaluate whether each game is fair.
Game: roll a die, win if prime, lose if composite. Fair? ___
Spinner: 3 equal sections but 2 say 'Player A wins'. Fair? ___
Design a fair two-player coin game: ___
Probability Summary
Write what you know about probability.
Probability is always between ___ and ___.
Formula: P(event) = ___
Three events with probabilities 0, 0.5 and 1: ___
One real-life use of probability: ___