Keystones — Lintel
Five GCSE retrieval questions · 10 October 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00045 in standard form
Answer: 4.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 17x + 72
Answer: (x - 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 27.96cm -
4. Ratio Mixed ratio problems
Divide 92 in the ratio 1:1:2
Answer: 23, 23 and 46 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 20, 46, 33, what is the missing number?
Answer: 33