Placing events on a probability scale from 0 (impossible) to 1 (certain), using fractions, decimals, or percentages.
Where your child meets this in real life: Understanding percentages in weather forecasts or betting odds
This topic isn't tested on its own, but it sits inside questions on tested topics. Each SEAG paper has 28 maths questions. Questions 29 to 50 are multiple choice with five possible answers, and questions 51 to 56 need a short written answer. With 56 questions in 60 minutes across English and maths, that is about a minute per question.
SEAGReady breaks probability scale into 3 steps, taught in order so each skill builds on the last.
Place events at the three key benchmark positions on the probability scale: 0 (impossible), 1/2 (even chance), and 1 (certain)
Place events at positions between the benchmarks using simple fractions (e.g., 1/6, 1/4, 3/4)
Express and recognise the same probability position as a fraction, decimal, or percentage
Try three free questions from our probability scale course. They start easy and get harder, so you can see where your child's confidence runs out. If they manage the last one without a hint, this topic is probably secure. If not, the steps above show where to start.
Max has a fair coin. He flips it once. Where should he place 'getting tails' on the probability scale?
Ruby picks a letter at random from the word BASKETS. Where on the probability scale is 'picking a vowel'?
Cara is playing a game. The probability of winning is shown as 3/8. Express this as a decimal and say whether winning is likely or unlikely.
This is the exact interactive worked example your child sees in SEAGReady. Step through it and watch the method build up.
Emma has a fair coin. She is going to flip it once.
Where should she place 'getting heads' on the probability scale?
P(heads) = ?
A fair coin can land on heads or tails
Step 1 of 4
Emma has a fair coin. She is going to flip it once.
Where should she place 'getting heads' on the probability scale?
Getting heads is at ½ (the middle) on the probability scale.
The key insight: The probability scale has three anchor points: 0 (impossible), ½ (even chance), and 1 (certain).
Common mix-up: Placing heads at 1 because I think it will happen. 1 means certain (it MUST happen). Heads might happen but tails might too.
These are the misconceptions we see most often in probability scale, including the ones our practice questions are specifically designed to catch.
Struggling with probability scale? The real gap is often in one of these earlier topics.
Sitting the SEAG test this November? Read our last-month revision plan, Paper 1 vs Paper 2 and test day guide.
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