Keystones — Lintel
Five GCSE retrieval questions · 19 July 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.031 in standard form
Answer: 3.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 40
Answer: (x + 5)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 59°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.39cm -
4. Ratio Mixed ratio problems
Divide 147 in the ratio 1:4:2
Answer: 21, 84 and 42 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 16, 29, 35, 44, what is the missing number?
Answer: 26