Keystones — Capstone
Five GCSE retrieval questions · 11 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√18
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 3x - 5
Answer: (x + 3⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 22cm, angle = 52°. Give your answer to 2 decimal places
Answer: 130.02cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 56:21:9 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 44, 67, 45, 35, 15, 43. Give your answer to 2 decimal places
Answer: Mean = 44.14, Median = 44, Range = 52