Keystones — Lintel
Five GCSE retrieval questions · 25 February 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0002 in standard form
Answer: 2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 60
Answer: (x + 5)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 61°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.21cm -
4. Ratio Mixed ratio problems
Orange, purple and pink counters are in the ratio 12:1:10. What fraction of the counters are pink?
Answer: 10⁄23 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 20, 47, 33, 17, what is the missing number?
Answer: 68