Keystones — Capstone
Five GCSE retrieval questions · 21 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: 3x² - 6x + 2
Answer: 3(x - 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 30cm, angle = 73°. Give your answer to 2 decimal places
Answer: 215.17cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 10:45:81 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 92, 70, 25, 27, 65, 35, 14, 38. Give your answer to 2 decimal places
Answer: Mean = 46.44, Median = 38, Range = 78