Keystones — Lintel
Five GCSE retrieval questions · 15 November 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0051 in standard form
Answer: 5.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 32
Answer: (x + 4)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 8.41cm -
4. Ratio Mixed ratio problems
Red and blue sweets are in the ratio 15:4. What fraction of the sweets are red?
Answer: 15⁄19 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 48, 23, 29, 41, 18, what is the missing number?
Answer: 57