Did you know? A lower pack price does not always mean a lower unit price. Help a Secondary 2 student studying Food and Consumer Education compare like-for-like products by choosing the same quantity basis, calculating price per unit and checking whether the pack fits the actual need.
Try these original fictional prices: Pack A contains 400 g for $3.20, and Pack B contains 750 g for $5.25. A costs $0.80 per 100 g; B costs $0.70 per 100 g. B has the lower unit price, but buying it still requires more money upfront and provides a larger quantity.
Use the current school FCE task and actual label information. These are invented arithmetic examples, not current shop prices, nutritional advice or a recommendation to buy a product. Lower-secondary FCE and later SEC Nutrition and Food Science have different scope; a Posting Group does not specify a consumer-learning assessment.
eduKateSengkang · Secondary 2 learning
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Choose the question closest to today’s difficulty. Each section offers a small action and a way to check understanding.
1. Read price and quantity together
2. Choose one common quantity basis
3. Calculate and reverse-check the unit price
4. Check whether the products are comparable
Contents: six practical learning steps
Record the full price and stated net quantity for each product. Check that both figures concern the same pack and that any advertised offer actually applies. A shelf label and a different pack’s quantity cannot form a valid comparison.
For school work, identify whether the task concerns mass, volume or number of items. Grams, millilitres and individual pieces are different bases. Do not compare a price per 100 g directly with a price per 100 mL as though the units were identical.
Our fictional packs both use grams, so price per 100 g gives a convenient shared basis. Price per kilogram would also work if calculated consistently. The choice of unit should make the comparison clear, not favour a particular pack.
Ask the student to label the answer before calculating: dollars per 100 g. This makes the division’s purpose visible. A bare decimal such as 0.80 does not tell the reader whether it is a pack price, unit price or discount.
For A, $3.20 ÷ 400 × 100 = $0.80 per 100 g. For B, $5.25 ÷ 750 × 100 = $0.70 per 100 g. Keep the units attached to the result rather than comparing numbers produced on different bases.
Reverse-check A: four groups of 100 g at $0.80 give $3.20. For B, 7.5 groups at $0.70 give $5.25. This confirms the calculated rate connects back to the supplied pack quantity and price.
B is cheaper per 100 g, but its pack costs $5.25 rather than $3.20. If the task sets a $4 spending limit, B cannot be purchased within that limit. A lower unit price does not remove a stated budget constraint.
If the task requires only 300 g, consider what happens to the extra quantity under the supplied conditions. Do not assume unused food is always wasted or always stored safely. Use the information given and seek teacher guidance for food-handling questions.
A unit-price calculation compares a particular cost measure. It does not establish that products are identical in quality, ingredients, suitability or usable quantity. Read the relevant labels and task criteria before declaring one option universally better.
Treat discounts and multi-pack offers carefully. Identify the eligible purchase and resulting total quantity before calculating. Do not invent current promotion terms or assume a displayed saving applies to every shopper or every pack.
Try another fictional pair: 250 g for $1.50 and 600 g for $4.20. Their unit prices are $0.60 and $0.70 per 100 g respectively. This time, the smaller pack has the lower unit price.
Ask for the calculation, the unit and one relevant purchase constraint. Track reading, denominator, arithmetic and decision criteria separately. Continue with teacher feedback and the actual FCE task; later SEC preparation must follow the applicable Nutrition and Food Science course and examination year.
Useful learning routes
Plan learning after PSLE · Explore later subject-specific SEC routes
Official sources and scope
MOE lower-secondary Food and Consumer Education syllabus
Practice situations and routines in this guide are original teaching illustrations, not official examination questions or marking schemes. Official sources provide curriculum context; follow current school instructions. These classroom workshops are not interchangeable SEC examination specifications.
Secondary 2: creative, consumer and movement learning
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