Keystones — Lintel
Five GCSE retrieval questions · 27 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.052 in standard form
Answer: 5.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 28
Answer: (x + 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 51°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.14cm -
4. Ratio Mixed ratio problems
Divide 132 in the ratio 4:1:1
Answer: 88, 22 and 22 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 26, 48, 42, 28, what is the missing number?
Answer: 21