Keystones — Lintel
Five GCSE retrieval questions · 26 August 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
310000
Answer: 3.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 38°. Find adjacent side
Answer: 26.8cm -
4. Ratio Mixed ratio problems
Divide 110 in the ratio 1:2:2
Answer: 22, 44 and 44 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 21, 44, 20, 24, what is the missing number?
Answer: 1