Keystones — Lintel
Five GCSE retrieval questions · 5 April 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.027 in standard form
Answer: 2.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 63
Answer: (x + 7)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 44°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.7cm -
4. Ratio Mixed ratio problems
Divide 168 in the ratio 1:2:4
Answer: 24, 48 and 96 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 32, 45, 33, 21, 22, what is the missing number?
Answer: 39