Keystones — Lintel
Five GCSE retrieval questions · 30 August 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.075 in standard form
Answer: 7.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x + 16
Answer: (x + 4)(x + 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 35°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.12cm -
4. Ratio Mixed ratio problems
Simplify: 6:10:10
Answer: 3:5:5 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 46, 47, 20, what is the missing number?
Answer: 47