Keystones — Lintel
Five GCSE retrieval questions · 12 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00037 in standard form
Answer: 3.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 16x + 55
Answer: (x - 5)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 27.43cm -
4. Ratio Mixed ratio problems
Simplify: 9:9:15
Answer: 3:3:5 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 47, 30, 28, 45, what is the missing number?
Answer: 5