Keystones — Capstone
Five GCSE retrieval questions · 23 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: x² - 7x + 12
Answer: (x - 7⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 15cm, angle = 41°. Give your answer to 2 decimal places
Answer: 103.33cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 35:40:32 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 25, 10, 17, 53, 56, 84, 53, 62. Give your answer to 2 decimal places
Answer: Mean = 49.11, Median = 53, Range = 74