Keystones — Lintel
Five GCSE retrieval questions · 10 September 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0066 in standard form
Answer: 6.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 2
Answer: (x + 1)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 25.31cm -
4. Ratio Mixed ratio problems
Simplify: 12:6:12
Answer: 2:1:2 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 32, 22, 47, what is the missing number?
Answer: 11