Keystones — Lintel
Five GCSE retrieval questions · 12 July 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00011
Answer: 1.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 52°. Find adjacent side
Answer: 9.9cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3m:300cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 22. If 5 of them are 30, 39, 21, 26, 24, what is the missing number?
Answer: -8