Keystones — Lintel
Five GCSE retrieval questions · 18 January 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0039
Answer: 3.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 48°. Find opposite
Answer: 21.cm -
4. Ratio Mixed ratio problems
Simplify: 9:18:12
Answer: 3:6:4 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 43, 16, 22, what is the missing number?
Answer: 55