Keystones — Lintel
Five GCSE retrieval questions · 20 September 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 7,700,000 in standard form
Answer: 7.7 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 46°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.23cm -
4. Ratio Mixed ratio problems
Black and white sweets are in the ratio 8:9. What fraction of the sweets are white?
Answer: 9⁄17 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 49, 31, 49, 42, what is the missing number?
Answer: 24