Keystones — Lintel
Five GCSE retrieval questions · 11 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 25,000 in standard form
Answer: 2.5 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 60
Answer: (x + 5)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 53°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.25cm -
4. Ratio Mixed ratio problems
Orange, purple and pink counters are in the ratio 9:1:10. What fraction of the counters are orange?
Answer: 9⁄20 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 25, 41, 36, 38, 39, what is the missing number?
Answer: 13