Keystones — Lintel
Five GCSE retrieval questions · 3 December 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
240000
Answer: 2.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 50°. Find adjacent side
Answer: 13.5cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3m:300cm
Answer: 1:100 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 46, 29, 34, what is the missing number?
Answer: -21