Keystones — Capstone
Five GCSE retrieval questions · 23 November 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 - 7x - 3
Answer: (x - 7⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 14cm, angle = 76°. Give your answer to 2 decimal places
Answer: 88.3cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 15:21:7 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 94, 27, 62, 52, 81, 55. Give your answer to 2 decimal places
Answer: Mean = 62.29, Median = 62, Range = 67