Keystones — Lintel
Five GCSE retrieval questions · 9 July 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0024 in standard form
Answer: 2.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 9
Answer: (x + 9)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 58°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.31cm -
4. Ratio Mixed ratio problems
Simplify the ratio £5 : 20p
Answer: 25:1 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 44, 22, 34, 21, what is the missing number?
Answer: 59