Keystones — Capstone
Five GCSE retrieval questions · 20 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√8
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: x² - 7x - 8
Answer: (x - 7⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 27cm, angle = 52°. Give your answer to 2 decimal places
Answer: 138.3cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 64:56:7 -
5. Statistics Averages and range
Find the mean, median and range of: 66, 34, 66, 13, 92, 97, 29. Give your answer to 2 decimal places
Answer: Mean = 56.71, Median = 66, Range = 84