Keystones — Lintel
Five GCSE retrieval questions · 11 December 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000045 in standard form
Answer: 4.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 24
Answer: (x + 3)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 57°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.16cm -
4. Ratio Mixed ratio problems
£224.00 is shared between A and B in the ratio 5:2. How much does A receive?
Answer: £160.00 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 46, 37, 26, 30, what is the missing number?
Answer: 26