Keystones — Capstone
Five GCSE retrieval questions · 9 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√275
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: 2x² - 4x - 7
Answer: 2(x - 1)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 19cm, angle = 46°. Give your answer to 2 decimal places
Answer: 184.51cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 81:72:8 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 59, 74, 29, 48, 13, 90, 10, 46. Give your answer to 2 decimal places
Answer: Mean = 48.67, Median = 48, Range = 80