Keystones — Lintel
Five GCSE retrieval questions · 30 January 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 820,000,000 in standard form
Answer: 8.2 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 70
Answer: (x + 7)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 24.66cm -
4. Ratio Mixed ratio problems
Simplify: 20:12:12
Answer: 5:3:3 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 27, 36, 32, what is the missing number?
Answer: 61