Keystones — Capstone
Five GCSE retrieval questions · 7 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - 11x + 3
Answer: (x - 11⁄2)² - 109⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 15cm, angle = 54°. Give your answer to 2 decimal places
Answer: 182.03cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 64:24:9 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 71, 100, 66, 89, 87, 66. Give your answer to 2 decimal places
Answer: Mean = 82.43, Median = 87, Range = 34