Keystones — Lintel
Five GCSE retrieval questions · 25 November 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00047 in standard form
Answer: 4.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 28°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.13cm -
4. Ratio Mixed ratio problems
Divide 150 in the ratio 1:3:1
Answer: 30, 90 and 30 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 46, 22, 31, 30, what is the missing number?
Answer: 26