Keystones — Lintel
Five GCSE retrieval questions · 5 February 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.015
Answer: 1.5 × 10^-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 24
Answer: (x + 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 49°. Find opposite
Answer: 25.3cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3m:300cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 33, 31, 30, 38, what is the missing number?
Answer: 23