Keystones — Lintel
Five GCSE retrieval questions · 18 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0081 in standard form
Answer: 8.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 28
Answer: (x + 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 45°. Find opposite
Answer: 10cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 hours : 35 minutes
Answer: 24:7 -
5. Statistics Mean
Calculate the mean of: 9, 21, 33, 33, 9, 24, 35, 32
Answer: 24.5