Keystones — Lintel
Five GCSE retrieval questions · 13 March 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.071 in standard form
Answer: 7.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 50
Answer: (x + 5)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.45cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 hour : 30 minutes
Answer: 2:1 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 26, 43, 32, what is the missing number?
Answer: 43