Keystones — Lintel
Five GCSE retrieval questions · 8 May 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.024
Answer: 2.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 36°. Find adjacent side
Answer: 15.4cm -
4. Ratio Mixed ratio problems
Simplify: 8:16:12
Answer: 2:4:3 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 48, 38, 29, 47, 25, what is the missing number?
Answer: -7