Probability as a Number from 0 to 1 Worksheets, Grade 7 (7.SP.C.5) – Free PDF + Answer Key

First page of the probability as a number from 0 to 1 practice worksheet

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Key idea

P(event) = favourable outcomes ÷ total outcomes, giving a number from 0 to 1. 0 is impossible, 1 is certain, ½ is even. All the probabilities of one situation add to exactly 1. Two possible outcomes does not mean even chances.

Sample problems

Find P(green).
Find P(not green).
Add your two answers. What do you get, and why must it be that?
Find P(red or green).

Common mistakes to watch for

Answered 3. A probability is a fraction of the whole, so it needs the total underneath.
Said blue because there are more of them, without converting to a probability. True here, but the comparison must be between probabilities when totals differ.
Answered ₃⁄⁷ by comparing red with non-red. A probability's denominator is always the TOTAL, not the other group.

The answer key explains each one, so you can tell what a wrong answer means.

How to use this set

Teach with the slides (about 15 minutes), or watch the video together.
Practice with the worksheet. Questions climb from fluency to application to reasoning.
Check understanding with the exit ticket, and send the homework home.
Mark with the answer key — each answer shows the steps and the most likely mistake.