Keystones — Lintel
Five GCSE retrieval questions · 16 June 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000085 in standard form
Answer: 8.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 12
Answer: (x + 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 14.49cm -
4. Ratio Mixed ratio problems
Divide 135 in the ratio 1:1:3
Answer: 27, 27 and 81 -
5. Statistics Mean
Calculate the mean of: 29, 13, 46, 11, 47, 45, 8. Give your answer to 2 decimal places
Answer: 28.43