Keystones — Capstone
Five GCSE retrieval questions · 11 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √252
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: x² - 7x + 9
Answer: (x - 7⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 25cm, angle = 43°. Give your answer to 2 decimal places
Answer: 153.45cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 3:24:64 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 29, 97, 69, 16, 62, 74, 53, 68. Give your answer to 2 decimal places
Answer: Mean = 54.78, Median = 62, Range = 81