Keystones — Lintel
Five GCSE retrieval questions · 1 December 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 220,000,000 in standard form
Answer: 2.2 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x - 11
Answer: (x + 1)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.29cm -
4. Ratio Mixed ratio problems
Divide 154 in the ratio 1:4:2
Answer: 22, 88 and 44 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 29, 18, 33, what is the missing number?
Answer: 12