Keystones — Lintel
Five GCSE retrieval questions · 6 June 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00066 in standard form
Answer: 6.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 24
Answer: (x + 3)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 36°. Find adjacent side. Give your answer to 2 decimal places
Answer: 32.36cm -
4. Ratio Mixed ratio problems
Simplify: 6:12:15
Answer: 2:4:5 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 31, 23, 42, 34, 49, what is the missing number?
Answer: 61