Year 4 Maths: What Your Child Should Know in Australia

Year 4 is where primary maths starts to feel "grown up": decimals join fractions, multiplication facts have to pull real weight in multi-digit work, and estimation becomes a habit rather than an afterthought. This page is the Year 4 map for Australian parents - not a March cram list, and not a repeat of Year 3.

It builds on Year 3 maths, and leans on three skill guides you may already know: place value, fractions, and times tables without tears.

End-of-year destination (Australian Curriculum)

Aligned to the Year 4 mathematics achievement standard, students are working toward being able to:

• Use place value for tenths and hundredths in decimal form, and multiply natural numbers by multiples of 10
• Model financial and practical problems with number sentences and efficient strategies
• Use addition and multiplication-fact fluency to add, subtract, multiply and divide efficiently
• Round and estimate to check whether answers are reasonable
• Use properties of odd and even numbers
• Recognise equivalent fractions and connect fractions with decimal notation; count and place fractions on a number line
• Find unknown values in addition/subtraction equations; explore number patterns and simple algorithms
• Measure with scaled instruments; approximate perimeter and area; convert time units; compare angles to a right angle; use grid references and symmetry
• Create and critique data displays; talk about chance and variation in experiments

Decimals: place value past the ones

Tenths and hundredths are place value extended to the right of the decimal point. Money ($3.45) and metres (1.25 m) make this concrete. If hundreds-tens-ones still wobble, fix that first via the place value guide before stacking decimals on top.

Kitchen table: Count in tenths along a number line from 0 to 2; write money amounts two ways ($0.70 and 70 cents); ask what digit sits in the hundredths place.

Facts that finally earn their keep

Year 4 expects children to use addition and multiplication facts inside larger calculations - not only recite a single table. The curriculum picture across primary still points to growing fluency through 10 × 10; Year 3 focused hard on 2s, 3s, 4s, 5s and 10s. Keep practice short and strategic (times tables without tears).

Kitchen table: One unknown-factor chat ("6 × ? = 42") beats twenty timed tears. Link division every time.

Fractions meet decimals

Equivalence and fraction–decimal links are Year 4 headline work. Strips and number lines beat pizza-only mental models. See the fuller progression in fractions explained.

Kitchen table: Show 1/2 = 0.5 with a metre tape; place 3/4 on a 0–1 line; rename 2/4 as 1/2 with folded paper.

Measurement, space and data (without the worksheet fog)

Perimeter and area appear with approximation; angles are named relative to a right angle; grids and symmetry show up in maps and art. Data work moves to displays that need judging ("Is this graph fair?") and chance talk that includes dependent vs independent events in simple experiments.

Kitchen table: Measure a tabletop; estimate then check; sketch a bird's-eye grid of the backyard; spin a spinner twenty times and talk about what varied.

What "on track" can look like

An end-of-Year-4 child who is broadly progressing can often explain a decimal like 2.07; estimate whether 48 × 6 is nearer 300 or 250; show an equivalent for 1/2; solve a money story with a clear strategy; and read a simple scaled graph.

A slow 7 × 8 or an occasional regrouping prompt is ordinary mid-year. What warrants a closer look is the same wall every week - decimals that never stick, or facts that never transfer into multi-digit work. Use Is my child behind in maths? as a calmer frame than a single homework meltdown.

Bridging from Year 3 without rewriting last year

If Year 3 multiplication facts for 2, 3, 4, 5 and 10 are still soft, keep a light fact routine running while Year 4 introduces decimals - but do not freeze all new learning. Many children can explore tenths with money even as they firm up 7 × 8.

Financial problems in Year 4 are a gift for home: catalogues, pocket money, "is this estimate sensible?" Reasonableness is a curriculum goal, not a personality trait.

Patterns, unknowns and "working mathematically"

Finding missing numbers in addition/subtraction equations and spotting patterns in generated sequences sound abstract until you try them with a packing story ("boxes of 10") or a growing pattern of blocks. Ask "what stays the same? what changes?" before leaping to a formal rule.

Units, time and everyday data

Year 4 deepens measurement: converting between units when it makes sense (centimetres and metres; grams and kilograms), comparing areas with informal and more formal units, and reading scales on measuring tools. At home, cooking and DIY scraps beat photocopied conversion drills - "we need 1.5 litres; this jug is marked in millilitres" is the real skill.

Time and duration problems get harder: elapsed time across hour boundaries, calendars, and "is this estimate sensible for a journey?" Digital clocks are everywhere; do not assume analogue reading is automatic.

Simple data work - collecting categories, reading column graphs, noticing which category is largest - pairs well with family surveys ("favourite dinner") if you keep the sample tiny and the questions clear.

Multiplicative thinking in worded problems

Year 4 worded problems often hide the operation. Train a pause: "Are we making equal groups, sharing, comparing, or combining?" Drawing a quick array or bar sketch before choosing × or ÷ reduces wild guessing.

Remainders appear in sharing stories. Ask what the remainder means in context (leftover apples vs leftover people) rather than only writing "r 3".

When Year 4 feels harder than Year 3 overnight

Decimals, equivalent fractions and multi-digit multiplication can arrive in a cluster. If evenings turn into tears, shrink the session, return to concrete tools (money for tenths; fraction strips), and tell the teacher which bit collapsed - "decimals with money" is more useful than "maths is hard".

Help that respects the relationship

Stay under fifteen minutes. Ask for strategies out loud. Match homework to the teacher's current focus. If dread is rising, read maths anxiety in primary kids before adding drill.

FAQ

Must every table to 12 be instant by December?

Focus on secure facts used in multi-digit work, especially through 10 × 10 as the primary curriculum trajectory. Instant recall of every obscure fact is less important than flexible strategies and reasonableness checks.

Are algorithms the main goal?

Efficient written methods matter when understanding sits underneath. Ask which strategies the class uses so home language matches.

How is this different from the Year 3 guide?

Year 3 centres larger whole numbers, 2–5 and 10 facts, and unit fractions. Year 4 adds decimals, denser fraction–decimal work, and heavier use of facts inside bigger problems.

What if Year 3 place value never settled?

Pause decimal lessons at home and rebuild hundreds-tens-ones with materials. Decimals on a shaky floor tip over.

A note on NAPLAN timing

Year 5 NAPLAN sits in March of the following year for many families' planning horizon; Year 4 itself is for building the skills, not for commercial test packs. Steady number sense beats cramming.

A calm next step

Year 4 is a long runway. If you want a low-pressure snapshot of number skills at home, Ziado's free check is a one-off, roughly 10-minute adaptive diagnostic with partial results only - no account and no card. The full placement unlocks after signup. See Ziado maths afterward if you want an adaptive path. Individual and Family plans, if you continue later, start with a 14-day free trial of the full app.