Keystones — Lintel
Five GCSE retrieval questions · 6 June 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 23,000,000 in standard form
Answer: 2.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 45
Answer: (x + 5)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 58°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.31cm -
4. Ratio Mixed ratio problems
Divide 210 in the ratio 1:2:2
Answer: 42, 84 and 84 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 47, 18, 41, 33, what is the missing number?
Answer: 36