Keystones — Capstone
Five GCSE retrieval questions · 27 February 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² - 5x + 9
Answer: (x - 5⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 17cm, angle = 49°. Give your answer to 2 decimal places
Answer: 128.3cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 8:36:81 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 29, 66, 26, 32, 34, 18, 87, 75. Give your answer to 2 decimal places
Answer: Mean = 49.11, Median = 34, Range = 69