Keystones — Lintel
Five GCSE retrieval questions · 22 November 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0053 in standard form
Answer: 5.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 30
Answer: (x + 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 19.27cm -
4. Ratio Mixed ratio problems
Express the second part of 15:9 as a fraction in simplest form
Answer: 3⁄8 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 40, 32, 30, 39, what is the missing number?
Answer: 29