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Probability Fractions Worksheet

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Probability Fractions Worksheet

Use fractions to describe the chance of an outcome. Give fractions in their simplest form where possible.

Counters in a Bag

Study the counters in the grid. Imagine they are mixed in a bag, and one is selected without looking.

Red counter

Blue counter

Red counter

Blue counter

Blue counter

1.What fraction of the counters are red?
2.Which word best describes the chance of selecting a red counter?
  • Impossible
  • Unlikely
  • Likely
  • Certain
3.Write the probability of selecting a blue counter as a fraction.
4.Explain why the chance of selecting a red counter is 2/5.

Make a Counter Set

Use the space to show a set of six counters that matches the probability in the question.

5.Draw six counters using red and green. Make the probability of selecting red equal to 1/3.
6.For a six-counter set with a red-picking probability of 1/3, how many counters should be red and how many should be green?
7.In that set of six counters, what is the probability of selecting green? Give the fraction in simplest form and describe the chance using a probability word.
8.If you select one counter and replace it each time, how many red selections would you expect in 12 trials when the chance of red is 1/3?

Probability in Context

Use the total number of marbles to work out each probability.

9.A bag holds 4 green marbles, 3 purple marbles and 5 orange marbles. Which colour is most likely to be selected?
  • Green
  • Purple
  • Orange
10.For the bag of 12 marbles, what is the probability of selecting an orange marble? Give your answer in simplest form.
11.How can knowing the fractions of different-coloured marbles help someone predict what might happen when selecting a marble?

2 printable pages

  • Probability Fractions Worksheet, page 1 of 2: Counters in a Bag, Make a Counter Set

    Page 1

  • Probability Fractions Worksheet, page 2 of 2: Probability in Context

    Page 2

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