Keystones — Lintel
Five GCSE retrieval questions · 13 April 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 94,000,000 in standard form
Answer: 9.4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 39.81cm -
4. Ratio Mixed ratio problems
Simplify: 12:24:24
Answer: 1:2:2 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 26, 39, 41, what is the missing number?
Answer: 54