Keystones — Lintel
Five GCSE retrieval questions · 30 October 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 910,000 in standard form
Answer: 9.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 63
Answer: (x + 9)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 56°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.01cm -
4. Ratio Mixed ratio problems
Black, white and yellow sweets are in the ratio 5:5:7. What fraction of the sweets are yellow?
Answer: 7⁄17 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 28, 38, 16, 39, what is the missing number?
Answer: 14