Keystones — Lintel
Five GCSE retrieval questions · 5 February 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000037 in standard form
Answer: 3.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x + 6
Answer: (x - 2)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 17.5cm -
4. Ratio Mixed ratio problems
Simplify: 12:20:20
Answer: 3:5:5 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 21, 22, 38, 35, 16, what is the missing number?
Answer: 48