Keystones — Lintel
Five GCSE retrieval questions · 28 November 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
270000
Answer: 2.7 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 61°. Find adjacent side
Answer: 9.7cm -
4. Ratio Mixed ratio problems
In ratio 2:4:2, what fraction is the second part?
Answer: 4⁄8 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 28, 49, 50, what is the missing number?
Answer: 17