Keystones — Lintel
Five GCSE retrieval questions · 29 August 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
35000000
Answer: 3.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 30°. Find adjacent side
Answer: 17.3cm -
4. Ratio Mixed ratio problems
Divide 120 in the ratio 4:1:3
Answer: 60, 15 and 45 -
5. Statistics Mean
The mean of 6 numbers is 23. If 5 of them are 37, 50, 30, 42, 25, what is the missing number?
Answer: -46