Keystones — Lintel
Five GCSE retrieval questions · 29 January 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 59,000,000 in standard form
Answer: 5.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 90
Answer: (x + 9)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.86cm -
4. Ratio Mixed ratio problems
Simplify: 9:12:6
Answer: 3:4:2 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 24, 20, 49, 25, what is the missing number?
Answer: 67