Keystones — Lintel
Five GCSE retrieval questions · 6 December 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
390000
Answer: 3.9 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 24
Answer: (x + 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 60°. Find opposite
Answer: 39.8cm -
4. Ratio Mixed ratio problems
£161.00 is shared between A and B in the ratio 4:3. How much does A receive?
Answer: £92.00 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 33, 27, 21, what is the missing number?
Answer: 75