Keystones — Capstone
Five GCSE retrieval questions · 9 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √720
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: x² - 9x + 2
Answer: (x - 9⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 19cm, angle = 65°. Give your answer to 2 decimal places
Answer: 103.32cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 36:20:25 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 34, 63, 26, 27, 99, 65, 38. Give your answer to 2 decimal places
Answer: Mean = 49.63, Median = 41.5, Range = 73