Keystones — Lintel
Five GCSE retrieval questions · 22 April 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 360,000,000 in standard form
Answer: 3.6 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 99
Answer: (x + 11)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 37°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.98cm -
4. Ratio Mixed ratio problems
£210.00 is shared between A and B in the ratio 4:3. How much does A receive?
Answer: £120.00 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 47, 16, 22, 17, what is the missing number?
Answer: 48