Keystones — Lintel
Five GCSE retrieval questions · 13 July 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000042 in standard form
Answer: 4.2 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 30
Answer: (x + 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 38.55cm -
4. Ratio Mixed ratio problems
Simplify: 8:24:12
Answer: 2:6:3 -
5. Statistics Mean
Calculate the mean of: 26, 7, 48, 21, 25, 42, 48
Answer: 31