Keystones — Capstone
Five GCSE retrieval questions · 4 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: x² + x - 12
Answer: (x + 1⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 28cm, angle = 66°. Give your answer to 2 decimal places
Answer: 230.21cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 10:12:21 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 32, 95, 35, 65, 91, 67, 24, 41
Answer: Mean = 54, Median = 41, Range = 71