Keystones — Lintel
Five GCSE retrieval questions · 25 October 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00064 in standard form
Answer: 6.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 54
Answer: (x + 6)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.55cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 litres : 550 ml
Answer: 60:11 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 32, 37, 29, 21, what is the missing number?
Answer: 66