Keystones — Capstone
Five GCSE retrieval questions · 25 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √525
Answer: 5√21 -
2. Algebra Completing the square
Complete the square: 2x² + 16x - 14
Answer: 2(x + 4)² - 46 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 22cm, angle = 58°. Give your answer to 2 decimal places
Answer: 214.56cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 40:72:9 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 60, 91, 44, 47, 12, 86, 68, 67. Give your answer to 2 decimal places
Answer: Mean = 60.67, Median = 67, Range = 79