Keystones — Lintel
Five GCSE retrieval questions · 14 April 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0015
Answer: 1.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 27°. Find adjacent side
Answer: 32.cm -
4. Ratio Mixed ratio problems
Simplify the ratio 8m:800cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 21, 46, 29, 22, what is the missing number?
Answer: 72