Keystones — Lintel
Five GCSE retrieval questions · 18 September 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
450000
Answer: 4.5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 40°. Find adjacent side
Answer: 11.5cm -
4. Ratio Mixed ratio problems
Simplify the ratio 7m:700cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 20. If 5 of them are 17, 23, 19, 34, 21, what is the missing number?
Answer: 6