Keystones — Lintel
Five GCSE retrieval questions · 26 September 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 130,000 in standard form
Answer: 1.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 40
Answer: (x + 5)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 45°. Find opposite
Answer: 10cm -
4. Ratio Mixed ratio problems
Red, blue and green counters are in the ratio 3:3:7. What fraction of the counters are green?
Answer: 7⁄13 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 39, 22, 19, 50, 35, what is the missing number?
Answer: 51