Keystones — Capstone
Five GCSE retrieval questions · 1 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² - 7x - 11
Answer: (x - 7⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 14cm, angle = 46°. Give your answer to 2 decimal places
Answer: 75.53cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 9:63:35 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 13, 95, 43, 62, 45, 48. Give your answer to 2 decimal places
Answer: Mean = 55.86, Median = 48, Range = 82