Keystones — Lintel
Five GCSE retrieval questions · 7 July 2017 · 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 - 20x + 96
Answer: (x - 8)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 28.cm -
4. Ratio Mixed ratio problems
Simplify: 12:12:8
Answer: 3:3:2 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 39, 45, 16, 46, what is the missing number?
Answer: 19