Keystones — Lintel
Five GCSE retrieval questions · 21 February 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0031 in standard form
Answer: 3.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 40
Answer: (x + 4)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 63°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.26cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5 litres : 550 ml
Answer: 100:11 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 43, 31, 46, 17, what is the missing number?
Answer: 43