Keystones — Lintel
Five GCSE retrieval questions · 26 February 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
80000000
Answer: 8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 56°. Find opposite
Answer: 35.6cm -
4. Ratio Mixed ratio problems
Divide 240 in the ratio 4:3:3
Answer: 96, 72 and 72 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 40, 19, 17, 25, 27, what is the missing number?
Answer: 88