Keystones — Lintel
Five GCSE retrieval questions · 29 September 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.011 in standard form
Answer: 1.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 27
Answer: (x + 3)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 23.82cm -
4. Ratio Mixed ratio problems
Simplify the ratio £8 : 95p
Answer: 160:19 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 47, 40, 15, what is the missing number?
Answer: 26