Keystones — Capstone
Five GCSE retrieval questions · 19 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: 3x² - 30x - 9
Answer: 3(x - 5)² - 84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 17cm, angle = 40°. Give your answer to 2 decimal places
Answer: 109.27cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 14:21:9 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 99, 48, 23, 74, 86, 32, 34, 85. Give your answer to 2 decimal places
Answer: Mean = 62.78, Median = 74, Range = 76