Keystones — Lintel
Five GCSE retrieval questions · 11 January 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0023
Answer: 2.3 × 10^-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 34°. Find opposite
Answer: 8.8cm -
4. Ratio Mixed ratio problems
Divide 80 in the ratio 3:1:1
Answer: 48, 16 and 16 -
5. Statistics Mean
Calculate the mean of: 48, 49, 14, 49, 49, 11, 31
Answer: 35.9