Keystones — Lintel
Five GCSE retrieval questions · 4 July 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.045 in standard form
Answer: 4.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 10
Answer: (x + 2)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 32.36cm -
4. Ratio Mixed ratio problems
Orange, purple and pink counters are in the ratio 10:11:10. What fraction of the counters are pink?
Answer: 10⁄31 -
5. Statistics Mean
Calculate the mean of: 22, 32, 35, 35, 32, 47, 21, 46
Answer: 33.75