Keystones — Lintel
Five GCSE retrieval questions · 30 August 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 490,000 in standard form
Answer: 4.9 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 46°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.45cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 7:10. What fraction of the marbles are purple?
Answer: 10⁄17 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 32, 18, 30, 24, 26, what is the missing number?
Answer: 38