Keystones — Lintel
Five GCSE retrieval questions · 24 December 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00034 in standard form
Answer: 3.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 40
Answer: (x + 4)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 22.85cm -
4. Ratio Mixed ratio problems
Express the first part of 2:4 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 27, 50, 34, what is the missing number?
Answer: 13