Keystones — Lintel
Five GCSE retrieval questions · 16 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 610,000,000 in standard form
Answer: 6.1 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 36
Answer: (x - 4)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 32°. Find adjacent side. Give your answer to 2 decimal places
Answer: 30.53cm -
4. Ratio Mixed ratio problems
Simplify the ratio £8 : 90p
Answer: 80:9 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 31, 27, 41, what is the missing number?
Answer: 9