Keystones — Lintel
Five GCSE retrieval questions · 7 January 2023 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0004
Answer: 4 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 28
Answer: (x - 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 44°. Find opposite
Answer: 19.3cm -
4. Ratio Mixed ratio problems
£189.00 is shared between A and B in the ratio 5:4. How much does A receive?
Answer: £105.00 -
5. Statistics Mean
The mean of 4 numbers is 21. If 3 of them are 15, 28, 38, what is the missing number?
Answer: 3