Mathematics Addition & Subtractionusually ages 7–8

Addition and subtraction within 1000

Add and subtract within 1000 using concrete models, drawings, and strategies based on place value; understand composing and decomposing tens and hundreds

How to tell they’ve got it

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

Add two three-digit numbers using base-ten blocks or drawings, composing a ten or hundred when necessary
Subtract three-digit numbers, decomposing a ten or hundred when necessary
Relate the concrete/drawn strategy to a written method and explain why it works

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Try this together

Can your child add or subtract numbers in the hundreds — like '347 + 256' — by thinking about hundreds, tens, and ones separately, or drawing a diagram to help?

Where this sits on the map

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

Builds on

Fluent adding and subtracting within 100ages 7–8Adding/subtracting within 1000 extends within-100 skills

The three digits of a three-digit numberages 7–8Three-digit operations require three-digit place-value understanding

Addition and subtraction within 1000this skill · ages 7–8

Unlocks

Adding and subtracting (age 7+)ages 7–8Formal columnar methods build on conceptual understanding of composing/decomposing

Fluent adding and subtracting within 1000ages 8–9Fluency within 1000 builds on strategy-based adding/subtracting within 1000

Estimating by roundingages 7–9Estimating and checking applies to three-digit calculations

solid = must come firstdashed = helps

Curriculum alignment

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

Show candidate curriculum codes · 3 ACARA · 2 NSW · 3 VIC

Australian Curriculum v9 candidate

AC9M2N04high confidenceYear 2 · Number

add and subtract one- and two-digit numbers, representing problems using number sentences and solve using part-part-whole reasoning and a variety of calculation strategies

AC9M1N04high confidenceYear 1 · Number

add and subtract numbers within 20, using physical and virtual materials, part-part-whole knowledge to 10 and a variety of calculation strategies

AC9M4N06high confidenceYear 4 · Number

develop efficient strategies and use appropriate digital tools for solving problems involving addition and subtraction, and multiplication and division where there is no remainder

NSW syllabus codes & stages only

MA2-AR-01high confidenceMathematics K-10 · Stage 2

MA2-RN-01high confidenceMathematics K-10 · Stage 2

Victorian Curriculum 2.0 codes & levels only

VC2M2N04high confidenceMathematics · Level 2 · Number strand

VC2M3N05high confidenceMathematics · Level 3 · Number strand

VC2M1N04high confidenceMathematics · Level 1 · Number 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

Adding and subtracting (age 7+)ages 7–8 Adding numbersages 7–8 Addition and subtraction strategies (age 7+)ages 7–8 Estimating by roundingages 7–9

All Addition & Subtraction skills →