Predicting counts from probability worksheets

If something happens 3 times in 10, how often is it in 200 tries? These free printable worksheets turn a probability into a predicted count — the everyday use of probability — with every answer a whole number.

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Predicting counts from probability

The answer key prints on a separate page.

What's on this sheet

A probability is a rate, and a count is that rate applied. P(red) = 3/10 means 3 of every 10, so over 200 spins the walk splits the tries into 20 tens and takes 3 from each: 60. Saying it as “groups of ten, three from each” is what keeps it a multiplication a child understands rather than a formula, and it is why the numbers are built so the trials always divide the denominator.

Why this sheet works

The probability is shown as a fraction on some sheets and a percent on others, because 3/10 and 30% are the same rate said two ways and a child should meet both. Either way the trial count is chosen so the answer lands whole — no sheet asks for 62.5 of anything.

How this one works

P(a win) = 75%. In 80 games, how many are wins?

80÷4=20

3×20=60

75% is 75 out of every 100, which is 3 out of every 4 after dividing both by 25. So split the 80 into groups of 4: 80 ÷ 4 = 20.
Each group of 4 gives 3 of them, and there are 20 groups: 3 × 20 = 60.

Predict counts from probabilityFractions and percents

Name: Date:

Predict how many times each event happens.

P(a win) = 75%. In 80 games, how many are wins?

P(red) = 15. In 40 spins, how many land on red?

P(a win) = 34. In 80 games, how many are wins?

P(a win) = 50%. In 80 games, how many are wins?

P(blue) = 25%. In 40 draws, how many are blue?

P(a win) = 12. In 60 games, how many are wins?

P(blue) = 310. In 200 draws, how many are blue?

P(heads) = 60%. In 200 flips, how many are heads?

Predict counts from probability · Fractions and percentsAnswer key

1. P(a win) = 75%. In 80 games, how many are wins? → 602. P(red) = . In 40 spins, how many land on red? → 83. P(a win) = . In 80 games, how many are wins? → 604. P(a win) = 50%. In 80 games, how many are wins? → 405. P(blue) = 25%. In 40 draws, how many are blue? → 106. P(a win) = . In 60 games, how many are wins? → 307. P(blue) = . In 200 draws, how many are blue? → 608. P(heads) = 60%. In 200 flips, how many are heads? → 120

Predicting counts from probability worksheets

What's on this sheet

How this one works

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