Keystones — Lintel
Five GCSE retrieval questions · 28 November 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.073 in standard form
Answer: 7.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 12x + 32
Answer: (x + 8)(x + 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 9.81cm -
4. Ratio Mixed ratio problems
Orange, purple and pink counters are in the ratio 6:4:7. What fraction of the counters are pink?
Answer: 7⁄17 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 15, 17, 45, 31, what is the missing number?
Answer: 22