Keystones — Lintel
Five GCSE retrieval questions · 15 February 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.099
Answer: 9.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x + 8
Answer: (x - 2)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 39°. Find opposite
Answer: 13cm -
4. Ratio Mixed ratio problems
Simplify: 18:12:6
Answer: 3:2:1 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 20, 22, 40, what is the missing number?
Answer: 50