Keystones — Lintel
Five GCSE retrieval questions · 23 July 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
340000
Answer: 3.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 54°. Find opposite
Answer: 22cm -
4. Ratio Mixed ratio problems
Divide 133 in the ratio 2:3:2
Answer: 38, 57 and 38 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 24, 42, 34, what is the missing number?
Answer: 56