Keystones — Lintel
Five GCSE retrieval questions · 4 January 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0009 in standard form
Answer: 9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 12
Answer: (x + 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 36°. Find adjacent side. Give your answer to 2 decimal places
Answer: 32.36cm -
4. Ratio Mixed ratio problems
Simplify: 6:4:8
Answer: 3:2:4 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 47, 42, 15, 33, what is the missing number?
Answer: 43