Keystones — Capstone
Five GCSE retrieval questions · 8 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: 4x² + 24x - 9
Answer: 4(x + 3)² - 45 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 29cm, angle = 68°. Give your answer to 2 decimal places
Answer: 174.77cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 28:20:15 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 45, 87, 73, 61, 60, 25, 60, 43
Answer: Mean = 57, Median = 60, Range = 62