Keystones — Capstone
Five GCSE retrieval questions · 4 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √72
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: x² - 7x - 9
Answer: (x - 7⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 22cm, angle = 60°. Give your answer to 2 decimal places
Answer: 209.58cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 63:18:8 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 54, 95, 97, 15, 66, 93. Give your answer to 2 decimal places
Answer: Mean = 70.43, Median = 73, Range = 82