Keystones — Lintel
Five GCSE retrieval questions · 29 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 910,000,000 in standard form
Answer: 9.1 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 21
Answer: (x + 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.21cm -
4. Ratio Mixed ratio problems
In ratio 2:7:11, what fraction is the second part?
Answer: 7⁄20 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 21, 17, 17, 29, what is the missing number?
Answer: 56