Keystones — Capstone
Five GCSE retrieval questions · 8 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 5x² - 50x - 8
Answer: 5(x - 5)² - 133 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 30cm, angle = 40°. Give your answer to 2 decimal places
Answer: 183.19cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 28:24:27 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 87, 36, 49, 52, 43, 84, 73. Give your answer to 2 decimal places
Answer: Mean = 62.13, Median = 62.5, Range = 51