Keystones — Lintel
Five GCSE retrieval questions · 14 August 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
330000
Answer: 3.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 60°. Find adjacent side
Answer: 16cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3m:300cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 20. If 5 of them are 38, 42, 23, 47, 38, what is the missing number?
Answer: -68