Keystones — Lintel
Five GCSE retrieval questions · 12 October 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 380,000,000 in standard form
Answer: 3.8 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 16
Answer: (x + 8)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 59°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.09cm -
4. Ratio Mixed ratio problems
£161.00 is shared between A and B in the ratio 3:4. How much does A receive?
Answer: £69.00 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 41, 34, 30, 28, 40, what is the missing number?
Answer: 37