Keystones — Capstone
Five GCSE retrieval questions · 16 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: 4x² - 16x - 7
Answer: 4(x - 2)² - 23 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 23cm, angle = 48°. Give your answer to 2 decimal places
Answer: 239.29cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 56:40:15 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 10, 43, 47, 41, 47, 35, 51, 73. Give your answer to 2 decimal places
Answer: Mean = 45.44, Median = 47, Range = 63