Keystones — Lintel
Five GCSE retrieval questions · 28 February 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
760000
Answer: 7.6 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 40°. Find opposite
Answer: 22.7cm -
4. Ratio Mixed ratio problems
£432.00 is shared between A and B in the ratio 5:4. How much does A receive?
Answer: £240.00 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 23, 24, 19, 36, what is the missing number?
Answer: 8