Discounts and GST
Solve and estimate financial problems in Australian dollars involving percentage discounts and adding the 10% GST to prices given before GST (recognising that GST-inclusive prices already contain it), using a calculator or spreadsheet where appropriate
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Discounts and GST means practising the idea at the table with counters or paper models and one clear check. We will demo once, then your child tries.
Materials: Two colours of counters; Paper for ratio or percent notation. 1. Say the goal of Discounts and GST in plain words once. 2. Adult shows 2 red : 3 blue and says the ratio (or 40% of 10). 3. Child builds three ratios or percentage amounts and records each notation. 4. Fresh check: one fresh ratio or percent reading. Record and stop. Done: three correct ratio/percent records. Proof: parent note of examples and results. Stop: End after the fresh check; keep optional challenge for another day.
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BBC Bitesize · Practice link — not the full lesson
KS2 Maths
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KS2 Maths supports Discounts and GST. An adult previews and guides; this is a learning page, not a scored quiz.
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Before you openAsk the learner one fact they learned and one question they still have.
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Source, access and review notes
Public BBC Bitesize page. An anonymous GET on 2026-11-12 returned HTTP 200 with no login or payment prompt for this URL. Opening the link does not save practice or assess mastery. An adult should preview and guide the learner.
BBC Bitesize. “KS2 Maths.” External page; Gakuva does not copy, host, embed, or redistribute materials.
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Check understanding
- Work out the sale price of an $80 jacket with a 25% discount and estimate it first as about $60
- For a $45 price given before GST, find the 10% GST of $4.50 and the GST-inclusive price of $49.50, and explain why a price already marked 'GST inclusive' does not get another 10% added
- Use a spreadsheet or calculator formula to apply a 15% discount to a list of prices and check one result by estimation
“If your child sees an $80 jacket marked 25% off, can they work out the sale price — and for a $45 price shown before GST, work out what you'd pay once the 10% GST is added?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Measurement
- Age range
- Ages 11–12
Standards