Keystones — Lintel
Five GCSE retrieval questions · 8 May 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
20000000
Answer: 2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 41°. Find opposite
Answer: 21.7cm -
4. Ratio Mixed ratio problems
£217.00 is shared between A and B in the ratio 5:2. How much does A receive?
Answer: £155.00 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 48, 34, 42, 26, what is the missing number?
Answer: 15