Keystones — Capstone
Five GCSE retrieval questions · 30 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √468
Answer: 6√13 -
2. Algebra Completing the square
Complete the square: x² + 7x + 4
Answer: (x + 7⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 27cm, angle = 72°. Give your answer to 2 decimal places
Answer: 166.91cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 4:14:49 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 93, 98, 73, 59, 11, 44. Give your answer to 2 decimal places
Answer: Mean = 61.29, Median = 59, Range = 87