Keystones — Lintel
Five GCSE retrieval questions · 5 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0079 in standard form
Answer: 7.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 14
Answer: (x - 2)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 16.82cm -
4. Ratio Mixed ratio problems
Red and blue sweets are in the ratio 14:5. What fraction of the sweets are blue?
Answer: 5⁄19 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 31, 24, 20, 44, what is the missing number?
Answer: 31