Keystones — Capstone
Five GCSE retrieval questions · 29 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√275
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: x² - 11x + 5
Answer: (x - 11⁄2)² - 101⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 20cm, angle = 66°. Give your answer to 2 decimal places
Answer: 173.57cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 49:21:15 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 57, 85, 51, 89, 42, 35, 99. Give your answer to 2 decimal places
Answer: Mean = 61.88, Median = 54, Range = 64