Mathematics Probability Procedural 10–11 yrs

Calculating Simple Probability

简单概率的计算

Description

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

Mastery Evidence

✓ 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 your child work out the probability of picking a red one and express it as a fraction in its simplest form?