Keystones — Lintel
Five GCSE retrieval questions · 7 November 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0046 in standard form
Answer: 4.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 84
Answer: (x + 7)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 45°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.21cm -
4. Ratio Mixed ratio problems
Divide 44 in the ratio 1:2:1
Answer: 11, 22 and 11 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 31, 19, 44, 40, 27, what is the missing number?
Answer: 49