Keystones — Capstone
Five GCSE retrieval questions · 13 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: x² + 5x - 11
Answer: (x + 5⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 13cm, angle = 55°. Give your answer to 2 decimal places
Answer: 69.22cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 27:63:35 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 74, 22, 57, 18, 88, 65, 38
Answer: Mean = 52, Median = 55.5, Range = 70