Keystones — Capstone
Five GCSE retrieval questions · 9 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: x² - 11x - 7
Answer: (x - 11⁄2)² - 149⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 12cm, angle = 63°. Give your answer to 2 decimal places
Answer: 96.23cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 14:18:3 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 28, 95, 53, 93, 49, 70. Give your answer to 2 decimal places
Answer: Mean = 58.71, Median = 53, Range = 72