Keystones — Lintel
Five GCSE retrieval questions · 17 February 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00055 in standard form
Answer: 5.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 31.46cm -
4. Ratio Mixed ratio problems
Simplify: 12:16:20
Answer: 3:4:5 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 46, 17, 21, 43, 30, what is the missing number?
Answer: 41