Keystones — Lintel
Five GCSE retrieval questions · 10 August 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 11,000,000 in standard form
Answer: 1.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 19x + 84
Answer: (x - 7)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 8.cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 hours : 25 minutes
Answer: 48:5 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 41, 18, 22, 36, what is the missing number?
Answer: 48