Keystones — Lintel
Five GCSE retrieval questions · 3 March 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0099 in standard form
Answer: 9.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 45
Answer: (x + 9)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 48°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.07cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 15:5. What fraction of the counters are black?
Answer: 3⁄4 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 38, 17, 48, what is the missing number?
Answer: 45