Keystones — Lintel
Five GCSE retrieval questions · 10 October 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00094 in standard form
Answer: 9.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 18
Answer: (x + 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 12.15cm -
4. Ratio Mixed ratio problems
Simplify: 12:12:24
Answer: 1:1:2 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 48, 47, 41, 23, 44, what is the missing number?
Answer: 13