Keystones — Lintel
Five GCSE retrieval questions · 28 December 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 930,000,000 in standard form
Answer: 9.3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 10
Answer: (x + 1)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 28.29cm -
4. Ratio Mixed ratio problems
Divide 126 in the ratio 2:4:3
Answer: 28, 56 and 42 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 47, 50, 40, 23, what is the missing number?
Answer: 30