Keystones — Lintel
Five GCSE retrieval questions · 20 November 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0042 in standard form
Answer: 4.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 16
Answer: (x + 2)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.08cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 hour : 25 minutes
Answer: 12:5 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 34, 48, 37, what is the missing number?
Answer: 9