Keystones — Lintel
Five GCSE retrieval questions · 2 April 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.032
Answer: 3.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 49°. Find opposite
Answer: 26.5cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m:200cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 24, 47, 33, 42, 18, what is the missing number?
Answer: 46