Keystones — Capstone
Five GCSE retrieval questions · 2 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√250
Answer: 15√10 -
2. Algebra Completing the square
Complete the square: x² + 3x - 7
Answer: (x + 3⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 15cm, angle = 73°. Give your answer to 2 decimal places
Answer: 129.cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 14:10:25 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 69, 85, 21, 42, 36, 69, 31, 76. Give your answer to 2 decimal places
Answer: Mean = 52.11, Median = 42, Range = 64