Year 2 Maths: Every Australian Curriculum Code, Explained

Year 2 Maths in the Australian Curriculum Version 9 is 18 content descriptions, AC9M2A01 through AC9M2ST02. Three more than Year 1, and the extra codes are not padding: Year 2 is where multiplication stops being skip counting in disguise and becomes named operations with recall facts, and where fractions arrive as a formal idea for the first time. Both changes reach well past this year, into every times-table and every fraction question a child meets from here on.

This is a working guide to all 18 codes: what changes from Year 1, the three descriptors that decide whether Year 3 goes well, a term-by-term order, and the checks that tell you whether a child is ready to move on.

What changes this year

Year 1 asked children to skip count by twos, fives and tens as a pattern (AC9M1A01). Year 2 turns that pattern into an operation. AC9M2A03 asks students to recall multiplication facts for twos and, critically, to extend and apply those facts to develop related division facts using doubling and halving. That last clause is doing real work: a child who can chant “two, four, six, eight” has not yet connected 4 × 2 to 8, and connecting them, in both directions, is the actual content of the descriptor. It is the first explicit times-table code in the curriculum, and everything from Year 3’s facts for 3, 4, 5 and 10 assumes doubling and halving already feels natural.

Fractions arrive alongside it. AC9M2N03 and AC9M2M02 introduce halves, quarters and eighths, connected explicitly through repeated halving, so a child folds a strip of paper in half, then in half again, and sees a quarter appear as “half of a half” rather than as an isolated new word. Place value also extends one place further, from AC9M1N02’s tens and ones to AC9M2N02’s hundreds, tens and ones, with the role of a zero digit in place value notation named for the first time, since a number like 105 is the first place where a Year 2 student has to represent an empty place rather than just a small one.

The year at a glance

Still no Probability strand, it starts next year with AC9M3P01. Measurement grows from three codes to five, the biggest strand shift of the year, because reading a clock and naming turns both join the strand for the first time.

Reading the codes

The pattern is unchanged from Year 1: AC9 + M + year + strand + number, so AC9M2N01 is Year 2 Number, position 1. Strand letters stay N Number, A Algebra, M Measurement, SP Space, ST Statistics, with P Probability still a year away.

Strand by strand

Number (AC9M2N01 to AC9M2N06)

AC9M2N01 extends counting and ordering to at least 1000. AC9M2N02 is this year’s new arrival: partitioning, rearranging, regrouping and renaming two- and three-digit numbers using standard and non-standard groupings, with the zero digit’s role named explicitly. It is the direct successor to Year 1’s tens-and-ones work and the most load-bearing descriptor in the year. AC9M2N03 introduces one-half as one of two equal parts, connecting halves, quarters and eighths through repeated halving.

AC9M2N04 extends addition and subtraction to one- and two-digit numbers using part-part-whole reasoning. AC9M2N05 is the new multiplicative descriptor: multiplying and dividing by one-digit numbers using repeated addition, equal grouping, arrays and partitioning. AC9M2N06 is the applied pair, modelling additive and multiplicative situations including money transactions, now expecting a chosen calculation strategy rather than an acted-out one.

Algebra (AC9M2A01 to AC9M2A03)

AC9M2A01 extends Year 1’s repeating patterns into additive patterns that increase or decrease by a constant amount, with missing elements to identify, which is number-line thinking wearing a pattern costume. AC9M2A02 asks for fluent recall of addition facts to 20 and the related subtraction facts, turning Year 1’s bridging strategy into automaticity. AC9M2A03, the multiplication and division facts for twos using doubling and halving, is covered above and is the descriptor the rest of the year’s multiplicative work depends on.

Measurement (AC9M2M01 to AC9M2M05)

AC9M2M01 extends informal-unit measuring from length alone to length, capacity and mass together, adding smaller units for accuracy when a larger one is too coarse. AC9M2M02 is the fractions-in-context descriptor, halves, quarters and eighths of shapes, objects and events. AC9M2M03 extends calendar work to counting days between events. AC9M2M04 is new: reading an analog clock to the hour, half-hour and quarter-hour, the first time reading a clock face is actually required. AC9M2M05 names quarter, half, three-quarter and full turns, which quietly previews angle language two years before AC9M4M03 makes angles explicit.

Space (AC9M2SP01 to AC9M2SP02)

AC9M2SP01 extends shape comparison with named spatial terms: opposite, parallel, curved and straight, giving students vocabulary to justify a classification rather than just make one. AC9M2SP02 moves Year 1’s giving-and-following-directions work into two-dimensional representations of a familiar space, the first step toward reading a simple map.

Statistics (AC9M2ST01 to AC9M2ST02)

AC9M2ST01 extends data collection to include experiment as a method alongside survey and observation, sorting into relevant categories with lists and tables. AC9M2ST02 asks for graphical representations created with software where appropriate, comparing representations and describing common and distinctive features, a step up from Year 1’s one-to-one displays.

The three codes that decide Year 3

AC9M2N02: hundreds, tens, ones, and the zero that means nothing is there

The misconception: that a zero in a number is just a placeholder to make the number look right, rather than a digit recording that a place holds nothing. A child can write 105 correctly from dictation while reading it as “one, oh, five” with no sense that the middle zero means zero tens.

What you will see: asked to build 105 with base-ten blocks, the child reaches for a tens block out of habit, or drops the zero entirely and writes 15. Asked which number is bigger, 105 or 150, a child who has not internalised place value may hesitate or guess, because both look similarly “busy”.

The fix: extend the bundling routine from Year 1 one level further, ones bundle into tens, tens bundle into hundreds, and deliberately build numbers with an empty middle place, 105, 209, 302, so the child has to physically show nothing where the tens block would go. Reading the number aloud while pointing at each physical group cements that the zero is a report, not a decoration.

AC9M2A03: multiplication as doubling, not a chant

The misconception: that multiplication facts are a memorised sequence of words, like a nursery rhyme, rather than a relationship between two numbers that also runs backwards into division.

What you will see: a child recites “two, four, six, eight, ten” fluently but, asked what 4 × 2 equals out of sequence, has to restart the chant from the beginning to find it. Asked the related division fact, how many twos in 8, they may not connect it to the multiplication chant at all.

The fix: use doubling as the entry point the descriptor names explicitly. Double 1, double 2, double 3, then flip the same fact into a division question, half of 8, half of 6, so multiplying by two and halving are taught as the same relationship viewed from two directions, not two separate skills.

AC9M2N03 and AC9M2M02: fractions as parts of a whole, not just words

The misconception: that “quarter” is a size word, like “small”, rather than a precise relationship to a whole. A child can point to a small piece of anything and call it a quarter regardless of whether four of that piece would actually rebuild the whole.

What you will see: asked to fold a strip of paper into quarters, a child tears it into four uneven pieces rather than halving twice. Asked whether a quarter is bigger or smaller than a half, some children guess bigger, reasoning that four sounds bigger than two.

The fix: insist on the repeated-halving method the descriptor names: fold in half for halves, fold in half again for quarters, once more for eighths, so each fraction is generated from the last by the same physical action, and the child sees the pieces get smaller as the number of folds increases, not bigger.

What students need to arrive with

Year 2 leans on three Year 1 codes directly. AC9M1N02 (tens and ones) is the prerequisite for extending place value to hundreds in AC9M2N02. AC9M1A01 (skip counting by twos, fives and tens) is the prerequisite for the multiplication facts in AC9M2A03, since doubling is skip counting by twos with a new name. AC9M1N04 (addition and subtraction within 20) is the prerequisite for fluent recall in AC9M2A02. A child who arrives without secure tens-and-ones understanding should not start three-digit regrouping; the fix is a short return to Year 1’s place value work rather than pushing ahead into hundreds.

What this year sets up

• AC9M2N02 (hundreds, tens and ones) becomes Year 3’s numbers beyond 10 000, the same structure extended two more places.
• AC9M2A03 (multiplication facts for twos) becomes Year 3’s facts for 3, 4, 5 and 10, the same doubling-and-halving relationship applied to new fact families.
• AC9M2N03 and AC9M2M02 (halves, quarters and eighths) become Year 3’s unit fractions, including thirds and fifths, the first year fractions are represented and combined as numbers in their own right.
• AC9M2M05 (quarter and half turns) becomes Year 4’s explicit angle work, once turn language has had two years to settle.

See Year 3 Maths and Year 4 Maths for how these codes carry forward. Our guide to which curriculum your state uses is worth checking if you are unsure whether AC9, VC2 or a NSW syllabus applies to your child.

A term-by-term order

1. Term 1: extend and consolidate. AC9M2N01 counting to 500, AC9M2SP01 and AC9M2SP02 shapes and directions, and AC9M2A02 fluent recall of facts to 20, confirming Year 1 held before adding new structure.
2. Term 2: hundreds, tens and ones. AC9M2N02 as the centrepiece with three-place bundling, alongside AC9M2M01 measuring length, capacity and mass with informal units.
3. Term 3: multiplication and fractions. AC9M2A03 doubling and halving as the entry to multiplication and division, paired with AC9M2N03 and AC9M2M02 halves, quarters and eighths through repeated folding.
4. Term 4: apply and extend. AC9M2N04 and AC9M2N05 addition, subtraction, multiplication and division problems, AC9M2N06 modelling money situations, AC9M2M03 and AC9M2M04 calendars and clock reading, AC9M2M05 turns, and AC9M2ST01 and AC9M2ST02 collecting and representing data.

Multiplication and fractions sit together in Term 3 because repeated halving is doubling run backwards, and teaching them side by side makes that connection visible instead of presenting two unrelated new topics in the same term.

Assessment checkpoints

• Number: build 105 with base-ten blocks. One hundred block, no tens blocks, five ones confirms AC9M2N02; reaching for a tens block or dropping the zero means reteach place value with a deliberately empty middle place.
• Algebra: ask for 4 × 2 out of sequence, then the related fact, half of 8. Answering both without restarting the twos chant confirms AC9M2A03; needing to recite from the start means reteach doubling as the entry point.
• Measurement: fold a paper strip into quarters and ask which is bigger, a half or a quarter. Even folds and a correct comparison confirm AC9M2M02; uneven tearing or the wrong comparison means reteach repeated halving.
• Space: ask the child to compare two shapes using the words parallel and curved. Using the vocabulary correctly confirms AC9M2SP01; pointing without naming means reteach the spatial terms explicitly.
• Statistics: from a class survey, ask the child to create a graph and describe one feature it shows. A specific, evidence-based description confirms AC9M2ST02; a vague answer means reteach comparing representations with a two-category question first.

Recording the alignment

Whether you are programming for a class or building evidence for a homeschool registration review, record the code on the activity as you go. “Maths games” tells a reviewer nothing; “AC9M2A03, doubling and halving with a deck of cards, 9 June” answers the question before it is asked. Our guide to state-by-state registration requirements covers what reviewers actually ask for, and helping your child with maths at home without a tutor covers how to work through a stuck code without turning it into a fight.

Sprout Lessons builds a full interactive lesson from any of these codes, pitched at Year 2 and wrapped in whatever your student is into, with self-checking practice that hints rather than just marking wrong, and the exact AC9 code recorded in the lesson footer. Try it free and generate a Year 2 Maths lesson in about a minute. You can also browse ready-made Year 2 Maths lessons against these codes directly.

Australian Curriculum content descriptions are © ACARA and licensed under CC BY 4.0. Quoted here unmodified. ACARA does not endorse this product. Always verify against the current content descriptions and achievement standards at australiancurriculum.edu.au.

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