Keystones — Capstone
Five GCSE retrieval questions · 2 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 5x² - 50x + 12
Answer: 5(x - 5)² - 113 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 19cm, angle = 68°. Give your answer to 2 decimal places
Answer: 246.63cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 15:12:32 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 47, 80, 99, 11, 55, 90, 27, 94. Give your answer to 2 decimal places
Answer: Mean = 61.33, Median = 55, Range = 88