Keystones — Lintel
Five GCSE retrieval questions · 2 December 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0098 in standard form
Answer: 9.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 6
Answer: (x - 1)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 27.61cm -
4. Ratio Mixed ratio problems
Divide 112 in the ratio 3:2:3
Answer: 42, 28 and 42 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 47, 30, 41, 40, 16, what is the missing number?
Answer: 54