Mathematics Probabilityusually ages 10–11

The 0-to-1 Probability Scale

Understand probability as a measure expressed as a number between 0 (impossible) and 1 (certain); place events on the probability scale; express probabilities as fractions, decimals, and percentages

How to tell they’ve got it

Tick these off as you see them — no test required.

Place events on a number line from 0 (impossible) to 1 (certain), expressing positions as fractions or decimals
Explain that a probability of 0.5 means 'even chance' and connect this to the informal word 'likely'
Convert between informal language ('very unlikely') and a numerical position on the 0-to-1 scale

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Try this together

Can your child write the same probability as a fraction, a decimal, and a percentage — for example, knowing that an even chance is ½, 0.5, and 50%?

Where this sits on the map

Stuck here? Check the skills it builds on first. Confident? Here’s what it unlocks.

Builds on

Probability as a Fractionages 9–10The formal 0-1 probability scale formalises the fractional representation of equally-likely outcomes introduced at age 9-10

Comparing fractionsages 7–8Expressing probability as fractions, decimals, and percentages requires comparing and ordering fractions — a skill built in the Fractions domain

The 0-to-1 Probability Scalethis skill · ages 10–11

Unlocks

Calculating Simple Probabilityages 10–11Calculating probability using favourable/total outcomes requires understanding probability as a number on a 0-1 scale

Probabilities Sum to Oneages 10–11The complement rule P(not A) = 1 − P(A) requires understanding probability as a number that lies between 0 and 1

solid = must come firstdashed = helps

Curriculum alignment

Candidate matches to official curriculum codes — machine-suggested, unreviewed (v0.1).

Show candidate curriculum codes · 3 ACARA · 1 NSW · 1 VIC

Australian Curriculum v9 candidate

AC9M6P01high confidenceYear 6 · Probability

recognise that probabilities lie on numerical scales of 0 – 1 or 0% – 100% and use estimation to assign probabilities that events occur in a given context, using common fractions, percentages and decimals

AC9M4P01medium confidenceYear 4 · Probability

describe possible everyday events and the possible outcomes of chance experiments and order outcomes or events based on their likelihood of occurring; identify independent or dependent events

AC9M5P01low confidenceYear 5 · Probability

list the possible outcomes of chance experiments involving equally likely outcomes and compare to those which are not equally likely

NSW syllabus codes & stages only

MA3-CHAN-01low confidenceMathematics K-10 · Stage 3

Victorian Curriculum 2.0 codes & levels only

VC2M6P01high confidenceMathematics · Level 6 · Probability strand

These are candidate alignments generated by semantic matching — machine-suggested and unreviewed (v0.1), not official or verified mappings. For official curriculum content see australiancurriculum.edu.au, curriculum.nsw.edu.au and f10.vcaa.vic.edu.au. Don’t rely on them for registration or compliance purposes.

Nearby on the map

Calculating Simple Probabilityages 10–11 Experimental vs Theoreticalages 10–11 Probabilities Sum to Oneages 10–11 Complementary eventsages 11–13

All Probability skills →