Keystones — Lintel
Five GCSE retrieval questions · 8 November 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00081 in standard form
Answer: 8.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x + 28
Answer: (x + 7)(x + 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 25.6cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 1:7:6. What fraction of the sweets are pink?
Answer: 3⁄7 -
5. Statistics Mean
Calculate the mean of: 14, 39, 19, 37, 11, 26, 48, 21. Give your answer to 2 decimal places
Answer: 26.88