Keystones — Capstone
Five GCSE retrieval questions · 20 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√125
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² - 3x - 8
Answer: (x - 3⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 23cm, angle = 62°. Give your answer to 2 decimal places
Answer: 142.15cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 35:21:12 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 64, 49, 33, 88, 73, 84, 87. Give your answer to 2 decimal places
Answer: Mean = 70.63, Median = 78.5, Range = 55