Keystones — Lintel
Five GCSE retrieval questions · 19 May 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0099
Answer: 9.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 38°. Find opposite
Answer: 7.8cm -
4. Ratio Mixed ratio problems
Simplify the ratio 7m:700cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 28, 39, 27, 30, 23, what is the missing number?
Answer: 87