Keystones — Capstone
Five GCSE retrieval questions · 28 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √304
Answer: 4√19 -
2. Algebra Completing the square
Complete the square: x² - 3x + 11
Answer: (x - 3⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 14cm, angle = 61°. Give your answer to 2 decimal places
Answer: 104.08cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 40:45:18 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 56, 24, 71, 52, 42, 43, 40, 59. Give your answer to 2 decimal places
Answer: Mean = 49.11, Median = 52, Range = 47