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Cogito

Grade 7 Math · Chapter 9 · Lesson 1

Practice Worksheet

Probability as a Number

From impossible to certain, on a scale of 0 to 1.

10 problems · about 17 minutes · 7.SP.C.5, 7.SP.C.7

NameDate

Figure — use these to answer the problems

A probability is a fraction, so it sits on the line between 0 and 1.
3/6
1/2
013/61/2

3/6 is equal to 1/2.

Outcomes wanted3
Outcomes possible6
Compare with1
Out of2
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

2 problems

  1. From “When Three Measurements Fix a Triangle”

    Can sides 4, 4 and 9 make a triangle? 1 for yes, 0 for no.

    Answer

  2. From “Angle Pairs”

    Supplement of 130°?

    Answer

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. A fair die. Out of 6, how many outcomes are less than 3?

    Answer

  2. What range does a probability lie in?

    • Between 0 and 1.
    • Any number at all.

  3. A fair die. Out of 6, how many outcomes are odd?

    Answer

  4. 5 red and 5 blue. Out of 10, how many give blue?

    Answer

Build It Up

The same ideas with more to keep track of.

2 problems

  1. What is the probability of something certain?

    Answer

  2. What is the probability of something impossible?

    Answer

Stretch Yourself

Mixed problems. Work out what kind of question it is before you start.

2 problems

  1. The Bag

    3 red and 7 blue. Out of 10, how many outcomes give red?

    Answer

  2. The Die

    A fair die. Out of 6, how many outcomes are greater than 4?

    Answer