Keystones — Capstone
Five GCSE retrieval questions · 24 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² - x + 2
Answer: (x - 1⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 19cm, angle = 69°. Give your answer to 2 decimal places
Answer: 115.3cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 5:20:8 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 45, 27, 35, 62, 78, 83, 39, 46. Give your answer to 2 decimal places
Answer: Mean = 48.44, Median = 45, Range = 62