Keystones — Lintel
Five GCSE retrieval questions · 26 March 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000066 in standard form
Answer: 6.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 59°. Find opposite. Give your answer to 2 decimal places
Answer: 36.61cm -
4. Ratio Mixed ratio problems
Simplify: 6:4:10
Answer: 3:2:5 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 48, 38, 34, what is the missing number?
Answer: 32