Keystones — Lintel
Five GCSE retrieval questions · 15 April 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00078 in standard form
Answer: 7.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 18
Answer: (x + 2)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 58°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.01cm -
4. Ratio Mixed ratio problems
In ratio 4:3:2, what fraction is the second part?
Answer: 1⁄3 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 18, 24, 20, 19, 43, what is the missing number?
Answer: 50