Keystones — Lintel
Five GCSE retrieval questions · 13 March 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.065
Answer: 6.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 33°. Find adjacent side
Answer: 26.8cm -
4. Ratio Mixed ratio problems
Simplify: 20:8:12
Answer: 5:2:3 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 47, 18, 17, 20, 30, what is the missing number?
Answer: 66