Keystones — Lintel
Five GCSE retrieval questions · 4 May 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000046 in standard form
Answer: 4.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.37cm -
4. Ratio Mixed ratio problems
Red and blue counters are in the ratio 7:2. What fraction of the counters are blue?
Answer: 2⁄9 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 30, 49, 18, 29, what is the missing number?
Answer: 14