Keystones — Capstone
Five GCSE retrieval questions · 9 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: x² + 11x + 5
Answer: (x + 11⁄2)² - 101⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 19cm, angle = 47°. Give your answer to 2 decimal places
Answer: 118.11cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 16:6:27 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 73, 39, 84, 68, 21, 95, 90. Give your answer to 2 decimal places
Answer: Mean = 63.13, Median = 70.5, Range = 74