Keystones — Lintel
Five GCSE retrieval questions · 27 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 70,000,000 in standard form
Answer: 7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 30
Answer: (x + 3)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 45°. Find opposite
Answer: 11cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 11:6. What fraction of the marbles are purple?
Answer: 6⁄17 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 40, 28, 44, what is the missing number?
Answer: 48