Keystones — Lintel
Five GCSE retrieval questions · 4 July 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 710,000 in standard form
Answer: 7.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 27
Answer: (x - 3)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 10.9cm -
4. Ratio Mixed ratio problems
Divide 160 in the ratio 2:1:1
Answer: 80, 40 and 40 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 44, 23, 44, 48, 15, what is the missing number?
Answer: 66