Mathematics·Probability·procedural
Calculating Simple Probability
Calculate the probability of a simple event with equally likely outcomes using the formula: probability = number of favourable outcomes ÷ total number of possible outcomes; express the result as a fraction in its simplest form; apply to rolling dice, drawing from bags, and other simple chance situations
Suggested ages 10–11
Evidence of understanding
- Calculate the probability of drawing a blue marble from a bag of 3 blue and 7 red as 3/10
- Use the formula P(event) = favourable outcomes ÷ total outcomes to solve at least three different problems
- Explain why increasing the number of favourable outcomes increases the probability
Assessment prompt
If there are 3 red and 7 blue balls in a bag, can Calculating Simple Probability work out the probability of picking a red one and express it as a fraction in its simplest form?
Standards alignment
No external standards are linked to this topic.