Keystones — Lintel
Five GCSE retrieval questions · 4 December 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 72,000 in standard form
Answer: 7.2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 36
Answer: (x + 4)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.14cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 litres : 250 ml
Answer: 12:1 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 20, 29, 42, 42, 30, what is the missing number?
Answer: 5