Probability: the probability of picking a red marble

In this Grade 7 lesson on Probability, you will practice solving problems like: "A bag has 20 marbles and 3 are red. What is the probability of picking a red marble?". Work through each problem carefully, use the hints if you need help, and check your answers. This builds your understanding of probability step by step.

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A bag has 20 marbles and 3 are red. What is the probability of picking a red marble?

1Read the problem carefully: "A bag has 20 marbles and 3 are red. What is the probability of picking a red marble?"

Problem 1 of 5

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Problem 1

A bag has 20 marbles and 3 are red. What is the probability of picking a red marble?

Problem 2 of 5

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Problem 2

There are 10 cards. 7 have stars. What is the probability of drawing a star card?

Problem 3 of 5

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Problem 3

There are 20 cards. 14 have stars. What is the probability of drawing a star card?

Problem 4 of 5

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Problem 4

There are 20 cards. 12 have stars. What is the probability of drawing a star card?

Problem 5 of 5

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Problem 5

A spinner has 10 equal sections and 9 are blue. What is the probability of landing on blue?

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Probability: the probability of picking a red marble

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