Keystones — Lintel
Five GCSE retrieval questions · 29 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0039 in standard form
Answer: 3.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 40
Answer: (x - 5)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 45°. Find opposite
Answer: 18cm -
4. Ratio Mixed ratio problems
Orange, purple and pink counters are in the ratio 1:7:3. What fraction of the counters are orange?
Answer: 1⁄11 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 49, 26, 21, 47, 17, what is the missing number?
Answer: 50