Keystones — Lintel
Five GCSE retrieval questions · 23 September 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.093
Answer: 9.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 42°. Find adjacent side
Answer: 28.2cm -
4. Ratio Mixed ratio problems
Divide 330 in the ratio 3:4:4
Answer: 90, 120 and 120 -
5. Statistics Mean
The mean of 5 numbers is 23. If 4 of them are 48, 40, 50, 46, what is the missing number?
Answer: -69