Keystones — Capstone
Five GCSE retrieval questions · 31 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
2. Algebra Completing the square
Complete the square: x² - 9x - 10
Answer: (x - 9⁄2)² - 121⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 25cm, angle = 61°. Give your answer to 2 decimal places
Answer: 251.45cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 63:56:32 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 44, 75, 94, 30, 79, 22
Answer: Mean = 62, Median = 75, Range = 72