Keystones — Lintel
Five GCSE retrieval questions · 9 December 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0086
Answer: 8.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 55°. Find opposite
Answer: 22.9cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5m:500cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 25, 30, 33, 46, what is the missing number?
Answer: 31