Keystones — Lintel
Five GCSE retrieval questions · 13 October 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00091
Answer: 9.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 31°. Find opposite
Answer: 16.2cm -
4. Ratio Mixed ratio problems
Simplify: 8:20:12
Answer: 2:5:3 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 22, 25, 28, 19, what is the missing number?
Answer: 16