Keystones — Lintel
Five GCSE retrieval questions · 18 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00064 in standard form
Answer: 6.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 2
Answer: (x + 1)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 13.33cm -
4. Ratio Mixed ratio problems
Simplify: 15:15:6
Answer: 5:5:2 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 24, 34, 43, 38, what is the missing number?
Answer: 31