Keystones — Lintel
Five GCSE retrieval questions · 31 March 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000039 in standard form
Answer: 3.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x + 12
Answer: (x + 6)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 41°. Find adjacent side. Give your answer to 2 decimal places
Answer: 26.41cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 hours : 15 minutes
Answer: 12:1 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 41, 16, 40, what is the missing number?
Answer: 51