Keystones — Lintel
Five GCSE retrieval questions · 10 October 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
260000
Answer: 2.6 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 10
Answer: (x - 2)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 53°. Find adjacent side
Answer: 23.5cm -
4. Ratio Mixed ratio problems
Divide 210 in the ratio 4:1:2
Answer: 120, 30 and 60 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 39, 24, 36, 16, what is the missing number?
Answer: 65