Keystones — Lintel
Five GCSE retrieval questions · 17 October 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.055 in standard form
Answer: 5.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 34°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.55cm -
4. Ratio Mixed ratio problems
Divide 184 in the ratio 3:3:2
Answer: 69, 69 and 46 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 37, 35, 30, 40, what is the missing number?
Answer: 23