Keystones — Lintel
Five GCSE retrieval questions · 14 April 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 8,800,000 in standard form
Answer: 8.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x + 12
Answer: (x + 6)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 43°. Find adjacent side. Give your answer to 2 decimal places
Answer: 28.52cm -
4. Ratio Mixed ratio problems
Divide 144 in the ratio 4:1:1
Answer: 96, 24 and 24 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 25, 28, 33, 38, 20, what is the missing number?
Answer: 24