Keystones — Lintel
Five GCSE retrieval questions · 11 September 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 870,000,000 in standard form
Answer: 8.7 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 72
Answer: (x + 12)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 20.8cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5m : 55cm
Answer: 100:11 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 36, 44, 50, what is the missing number?
Answer: 18