Keystones — Lintel
Five GCSE retrieval questions · 26 September 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00025 in standard form
Answer: 2.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 40
Answer: (x + 5)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 13.51cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5 hours : 55 minutes
Answer: 60:11 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 33, 35, 43, 26, what is the missing number?
Answer: 33