Keystones — Capstone
Five GCSE retrieval questions · 17 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √176
Answer: 4√11 -
2. Algebra Completing the square
Complete the square: x² - 7x + 5
Answer: (x - 7⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 27cm, angle = 64°. Give your answer to 2 decimal places
Answer: 364.01cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 15:24:56 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 35, 41, 33, 71, 10, 27. Give your answer to 2 decimal places
Answer: Mean = 43.71, Median = 35, Range = 79