Keystones — Capstone
Five GCSE retrieval questions · 31 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √486
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: x² + x - 3
Answer: (x + 1⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 28cm, angle = 57°. Give your answer to 2 decimal places
Answer: 317.02cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 8:72:81 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 77, 74, 90, 18, 73, 96, 66
Answer: Mean = 69.5, Median = 73.5, Range = 78