Keystones — Lintel
Five GCSE retrieval questions · 13 October 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 790,000,000 in standard form
Answer: 7.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 99
Answer: (x + 9)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.76cm -
4. Ratio Mixed ratio problems
Express the second part of 14:2 as a fraction in simplest form
Answer: 1⁄8 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 23, 21, 40, 33, what is the missing number?
Answer: 53