Keystones — Lintel
Five GCSE retrieval questions · 23 May 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00096 in standard form
Answer: 9.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 72
Answer: (x + 9)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 64°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.34cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5 litres : 300 ml
Answer: 50:3 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 27, 44, 40, what is the missing number?
Answer: 37