Keystones — Capstone
Five GCSE retrieval questions · 26 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √567
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: x² + 9x + 3
Answer: (x + 9⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 17cm, angle = 42°. Give your answer to 2 decimal places
Answer: 113.75cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 10:18:27 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 10, 17, 66, 51, 66, 21. Give your answer to 2 decimal places
Answer: Mean = 41.14, Median = 51, Range = 56