Keystones — Lintel
Five GCSE retrieval questions · 30 December 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.057 in standard form
Answer: 5.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 20
Answer: (x + 10)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 27.72cm -
4. Ratio Mixed ratio problems
Orange, purple and pink counters are in the ratio 10:6:12. What fraction of the counters are pink?
Answer: 3⁄7 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 36, 50, 38, 47, 28, what is the missing number?
Answer: 35