Curriculum placement
Grade 7. This describes the skill, not a learner estimate.
Probability of one event
Calculate simple event probabilities and compare observed frequencies
Problem types
- Probability of one draw
- Experimental and repeated-draw probability
- Experimental probability and predictions
- Recover a count from probability
- Certain, likely, unlikely or impossible
- A chance on a zero to one number line
- Choose the bag or spinner for a chance
- Probability and expected count
Builds on
- Understanding ratios
- A fraction times a whole number · Useful idea
The expected number of times an event happens is its probability times the number of trials.
- Comparing fractions · Useful idea
Which event is more likely is decided by comparing the fractions that give their probabilities.
- Fractions shown by a model · Useful idea
The probability of an outcome is the fraction of equally likely outcomes that match, a part of a whole.
- Fractions on a number line · Useful idea
The chance of an event with equally likely outcomes is a fraction between 0 and 1, so it sits on a number line cut into that many equal spaces, exactly where a fraction of that size is read.
- Fractions of an area · Useful idea
The probability of landing in a region is the fraction of the total area that the region covers.
- Halves, thirds, and quarters · Useful idea
Equal parts of a spinner give equal chances, so each third has chance 1/3.
- Halves and quarters of a whole · Useful idea
When a spinner is split into equal parts, the chance of landing on a half or a quarter is that fraction of the whole.
Leads to
Related skills
- Samples and the populations they represent · Related idea
The proportion in a representative sample estimates the probability that a random member has a given trait.
- Percent of a number · Related idea
A probability is a part-to-whole ratio, and a percentage is the same ratio per one hundred.
- Finding a unit rate · Shared foundations
Open the interactive map to explore lessons and skill connections.