Keystones — Capstone
Five GCSE retrieval questions · 18 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² + 9x + 10
Answer: (x + 9⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 14cm, angle = 73°. Give your answer to 2 decimal places
Answer: 100.41cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 6:15:25 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 76, 53, 40, 30, 29, 91, 28
Answer: Mean = 51, Median = 46.5, Range = 63