Keystones — Lintel
Five GCSE retrieval questions · 14 February 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000027 in standard form
Answer: 2.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 12
Answer: (x + 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 44.81cm -
4. Ratio Mixed ratio problems
Simplify: 18:18:15
Answer: 6:6:5 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 16, 34, 41, what is the missing number?
Answer: 61