Keystones — Lintel
Five GCSE retrieval questions · 13 February 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00052 in standard form
Answer: 5.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 28
Answer: (x + 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 13.08cm -
4. Ratio Mixed ratio problems
Orange, purple and pink counters are in the ratio 1:1:11. What fraction of the counters are orange?
Answer: 1⁄13 -
5. Statistics Mean
Calculate the mean of: 36, 26, 49, 21, 24, 23. Give your answer to 2 decimal places
Answer: 29.83