Keystones — Capstone
Five GCSE retrieval questions · 23 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: x² + 9x + 10
Answer: (x + 9⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 20cm, angle = 76°. Give your answer to 2 decimal places
Answer: 261.98cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 32:56:21 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 96, 46, 67, 18, 81, 46. Give your answer to 2 decimal places
Answer: Mean = 55.57, Median = 46, Range = 78