Keystones — Lintel
Five GCSE retrieval questions · 29 December 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000098 in standard form
Answer: 9.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 54
Answer: (x + 6)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 17.19cm -
4. Ratio Mixed ratio problems
Divide 112 in the ratio 2:1:4
Answer: 32, 16 and 64 -
5. Statistics Mean
Calculate the mean of: 8, 19, 20, 27, 13, 38, 29, 40
Answer: 24.25