Keystones — Lintel
Five GCSE retrieval questions · 22 September 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000084 in standard form
Answer: 8.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 16x + 55
Answer: (x - 5)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 20.8cm -
4. Ratio Mixed ratio problems
In ratio 7:5:3, what fraction is the third part?
Answer: 1⁄5 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 49, 49, 24, 36, what is the missing number?
Answer: 17