Keystones — Lintel
Five GCSE retrieval questions · 27 April 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 500,000,000 in standard form
Answer: 5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 15x + 36
Answer: (x - 3)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 33°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.97cm -
4. Ratio Mixed ratio problems
Express the second part of 10:8 as a fraction in simplest form
Answer: 4⁄9 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 33, 35, 40, 24, 22, what is the missing number?
Answer: 20