Keystones — Capstone
Five GCSE retrieval questions · 28 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√44
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² - 9x - 3
Answer: (x - 9⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 28cm, angle = 64°. Give your answer to 2 decimal places
Answer: 213.91cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 25:20:12 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 33, 50, 29, 74, 74, 88, 98, 75. Give your answer to 2 decimal places
Answer: Mean = 68.56, Median = 74, Range = 69