Keystones — Lintel
Five GCSE retrieval questions · 21 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00089 in standard form
Answer: 8.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 72
Answer: (x + 6)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 40°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.85cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5 litres : 800 ml
Answer: 25:4 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 21, 34, 39, 33, 37, what is the missing number?
Answer: 58