Keystones — Lintel
Five GCSE retrieval questions · 3 May 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000071 in standard form
Answer: 7.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 18
Answer: (x + 2)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.43cm -
4. Ratio Mixed ratio problems
Red, blue and green sweets are in the ratio 8:7:8. What fraction of the sweets are red?
Answer: 8⁄23 -
5. Statistics Mean
Calculate the mean of: 31, 31, 19, 12, 32, 32, 39
Answer: 28