Keystones — Capstone
Five GCSE retrieval questions · 11 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: 4x² - 48x - 3
Answer: 4(x - 6)² - 147 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 21cm, angle = 57°. Give your answer to 2 decimal places
Answer: 193.73cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 45:36:32 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 40, 48, 68, 58, 80, 53, 100, 92
Answer: Mean = 71, Median = 68, Range = 60