Keystones — Lintel
Five GCSE retrieval questions · 31 December 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00029
Answer: 2.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 60°. Find adjacent side
Answer: 16.5cm -
4. Ratio Mixed ratio problems
Divide 300 in the ratio 3:4:3
Answer: 90, 120 and 90 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 16, 16, 33, 25, what is the missing number?
Answer: 55