Keystones — Capstone
Five GCSE retrieval questions · 24 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √216
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: x² - 11x + 1
Answer: (x - 11⁄2)² - 117⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 28cm, angle = 50°. Give your answer to 2 decimal places
Answer: 203.77cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 32:40:25 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 67, 63, 20, 51, 94, 46. Give your answer to 2 decimal places
Answer: Mean = 54.14, Median = 51, Range = 74