Keystones — Lintel
Five GCSE retrieval questions · 6 March 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0047 in standard form
Answer: 4.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 24
Answer: (x + 3)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 44°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.46cm -
4. Ratio Mixed ratio problems
Red, blue and green counters are in the ratio 6:12:1. What fraction of the counters are green?
Answer: 1⁄19 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 31, 21, 20, 40, 33, what is the missing number?
Answer: 35