Keystones — Lintel
Five GCSE retrieval questions · 8 July 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0074 in standard form
Answer: 7.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 36
Answer: (x + 4)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 32°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.66cm -
4. Ratio Mixed ratio problems
Simplify: 20:20:12
Answer: 5:5:3 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 29, 15, 37, 38, what is the missing number?
Answer: 41