Keystones — Capstone
Five GCSE retrieval questions · 28 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√99
Answer: 12√11 -
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 = 22cm, b = 20cm, angle = 69°. Give your answer to 2 decimal places
Answer: 205.39cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 32:36:45 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 99, 37, 54, 12, 41, 90, 59, 56. Give your answer to 2 decimal places
Answer: Mean = 52.67, Median = 54, Range = 87