Keystones — Lintel
Five GCSE retrieval questions · 22 August 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00024
Answer: 2.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 44°. Find opposite
Answer: 12.6cm -
4. Ratio Mixed ratio problems
£300.00 is shared between A and B in the ratio 2:1. How much does A receive?
Answer: £200.00 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 43, 22, 20, what is the missing number?
Answer: 59