Free summary · Grade 7 Maths

Probability

From impossible to certain, outcomes and chance as a fraction. Read one part at a time and tap “I know this”. Then test yourself in the quiz.

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How likely?

Probability says how likely something is: impossible, unlikely, even chance, likely, certain.

The sun rises tomorrow: certain. A coin lands heads: even chance. A dice rolls 7: impossible.

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An outcome is a possible result. A dice has 6 outcomes. The chance of rolling a 4 = ⅙.

Rule

Probability = favourable outcomes ÷ all possible outcomes.

In an experiment you count what really happens (relative frequency); the more trials, the closer to the theoretical chance.

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Spinner with 4 equal parts (red, blue, green, yellow): the outcomes are red, blue, green and yellow. P(red) = ¼ = 0,25 = 25%.
P(even number on a die) = 3 out of 6 = ³⁄₆ = ½.
A probability can be written as a fraction, a decimal or a percentage, and is always from 0 to 1 (0% to 100%).

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Remember this: your summary

Write these points in your book. Read them again the night before the test.

Memory trick

0 = impossible, ½ = even chance, 1 = certain.

Flash cards · Tap to turn over

First say the answer yourself, then turn the card over.

Test yourself · Part 2

Read the question and the answer. Is the answer right? Tap True or False.

Now the real quiz!

The quiz has many more questions on this topic. Every question shows straight away whether you are right and explains why.

For parents

Let your child work the examples on paper and explain them to you.
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Follows CAPS for Grade 7 Mathematics. Always check your teacher’s notes and textbook too.