Keystones — Lintel
Five GCSE retrieval questions · 18 February 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.08 in standard form
Answer: 8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 120
Answer: (x + 10)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 56°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.62cm -
4. Ratio Mixed ratio problems
Divide 78 in the ratio 3:2:1
Answer: 39, 26 and 13 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 18, 32, 21, 19, what is the missing number?
Answer: 45