Worked example 1
Which is better value: 500 g for £2.40 or 750 g for £3.30?
- £2.40 ÷ 5 = 48p per 100 g
- £3.30 ÷ 7.5 = 44p per 100 g
Answer: 750 g for £3.30
Maths for adults · Everyday numeracy
Household budgeting and best-buy maths
Compare prices fairly and turn weekly or monthly costs into yearly totals — the core sums behind a household budget.
Learn
How it works
Unit price = price ÷ quantity. Compare like with like: price per 100 g, per litre or per item.
Weekly to yearly: × 52. Monthly to yearly: × 12. Yearly to monthly: ÷ 12.
Budget balance = income − total outgoings. A negative answer means you are overspending.
Worked example 2
A £4.50 weekly subscription — cost per year?
- £4.50 × 52
Answer: £234
Try it
Practice sheet
Everyday numeracy · Standard
Household budgeting and best buys
NameDate
Show how you compared or calculated.
- 1.£5.00 per week. Cost per year (52 weeks)?
- 2.Better value: 340 g for £1.62 or 900 g for £4.72?
- 3.Better value: 300 g for £2.79 or 700 g for £5.86?
- 4.£32 per month. Cost per year?
- 5.Better value: 390 g for £2.97 or 1200 g for £10.05?
- 6.Better value: 270 g for £1.08 or 1000 g for £4.40?
- 7.£12.00 per week. Cost per year (52 weeks)?
- 8.£9.50 per week. Cost per year (52 weeks)?
- 9.Better value: 360 g for £1.75 or 700 g for £3.06?
- 10.£8.50 per week. Cost per year (52 weeks)?
- 11.£14.00 per week. Cost per year (52 weeks)?
- 12.Better value: 220 g for £1.43 or 1200 g for £8.58?
Answers and explanations
- £5.00 per week. Cost per year (52 weeks)?£260.00£5.00 × 52 = £260.00.
- Better value: 340 g for £1.62 or 900 g for £4.72?340 gPer 100 g: 47.6p vs 52.4p.
- Better value: 300 g for £2.79 or 700 g for £5.86?700 gPer 100 g: 93.0p vs 83.7p.
- £32 per month. Cost per year?£384.00£32 × 12 = £384.00.
- Better value: 390 g for £2.97 or 1200 g for £10.05?390 gPer 100 g: 76.2p vs 83.8p.
- Better value: 270 g for £1.08 or 1000 g for £4.40?270 gPer 100 g: 40.0p vs 44.0p.
- £12.00 per week. Cost per year (52 weeks)?£624.00£12.00 × 52 = £624.00.
- £9.50 per week. Cost per year (52 weeks)?£494.00£9.50 × 52 = £494.00.
- Better value: 360 g for £1.75 or 700 g for £3.06?700 gPer 100 g: 48.6p vs 43.7p.
- £8.50 per week. Cost per year (52 weeks)?£442.00£8.50 × 52 = £442.00.
- £14.00 per week. Cost per year (52 weeks)?£728.00£14.00 × 52 = £728.00.
- Better value: 220 g for £1.43 or 1200 g for £8.58?220 gPer 100 g: 65.0p vs 71.5p.
Last reviewed: 25 September 2026