Keystones — Lintel
Five GCSE retrieval questions · 12 January 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 610,000 in standard form
Answer: 6.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 48
Answer: (x + 6)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 14.84cm -
4. Ratio Mixed ratio problems
Simplify: 12:6:15
Answer: 4:2:5 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 26, 19, 38, 31, what is the missing number?
Answer: 36