Keystones — Lintel
Five GCSE retrieval questions · 23 October 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 16,000,000 in standard form
Answer: 1.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 20
Answer: (x + 2)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 6.01cm -
4. Ratio Mixed ratio problems
Express the first part of 13:10 as a fraction in simplest form
Answer: 13⁄23 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 16, 23, 25, 34, what is the missing number?
Answer: 32