Keystones — Capstone
Five GCSE retrieval questions · 3 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √704
Answer: 8√11 -
2. Algebra Completing the square
Complete the square: 5x² + 50x - 10
Answer: 5(x + 5)² - 135 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 15cm, angle = 69°. Give your answer to 2 decimal places
Answer: 98.03cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 54:63:49 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 42, 17, 31, 61, 28, 44, 58
Answer: Mean = 47, Median = 43, Range = 78