Calculating probability as favourable outcomes ÷ total outcomes, expressing as fractions (and converting to decimals/percentages).
Where your child meets this in real life: Calculating chances with dice, cards, spinners, or selections
SEAGReady breaks calculate simple probabilities into 2 steps, taught in order so each skill builds on the last.
Calculate probability using favourable outcomes divided by total outcomes when the favourable outcome is directly stated
Calculate probability when favourable outcomes must be identified and counted based on a condition
Three free sample questions from our calculate simple probabilities course. Every question comes with a full explanation, and hints that guide without giving the answer away.
Rachel picks one counter at random from the bag shown. What is the probability she picks a blue counter?
The diagram shows the possible outcomes when Alice rolls a fair six-sided die. What is the probability of rolling a number greater than 4?
Dylan picks one marble at random from the bag shown. What is the probability of picking a green marble?
This is the exact interactive worked example your child sees in SEAGReady. Step through it and watch the method build up.
Isla has a bag with 3 red counters, 2 blue counters, and 5 green counters. She picks one counter without looking.
What is the probability of picking a red counter?
P(red) = ?
Set up a table with a Counter column and a Red? column
Step 1 of 5
Isla has a bag with 3 red counters, 2 blue counters, and 5 green counters. She picks one counter without looking.
What is the probability of picking a red counter?
The probability of picking a red counter is ³⁄₁₀.
The key insight: Probability is always favourable on top, total on the bottom!
Common mix-up: P(red) = ¹⁰⁄₃ (total on top). The favourable outcomes must be the numerator, total outcomes the denominator.
These are the misconceptions we see most often in calculate simple probabilities, including the ones our practice questions are specifically designed to catch.
Struggling with calculate simple probabilities? The real gap is often in one of these earlier topics.
SEAGReady finds the exact step where your child gets stuck, teaches it with worked examples like the one above, and brings it back for review so it sticks.
Free to start · no card needed