Keystones — Capstone
Five GCSE retrieval questions · 2 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 3x² - 24x + 3
Answer: 3(x - 4)² - 45 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 29cm, angle = 45°. Give your answer to 2 decimal places
Answer: 133.29cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 10:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 15, 16, 52, 25, 75, 56. Give your answer to 2 decimal places
Answer: Mean = 47.14, Median = 52, Range = 76