Keystones — Lintel
Five GCSE retrieval questions · 22 May 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00065
Answer: 6.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 30°. Find opposite
Answer: 9.2cm -
4. Ratio Mixed ratio problems
Divide 210 in the ratio 3:3:1
Answer: 90, 90 and 30 -
5. Statistics Mean
Calculate the mean of: 40, 44, 23, 5, 19, 38, 47
Answer: 30.9