Keystones — Capstone
Five GCSE retrieval questions · 7 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √360
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: x² + x - 8
Answer: (x + 1⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 28cm, angle = 63°. Give your answer to 2 decimal places
Answer: 199.59cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 40:45:54 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 45, 54, 22, 44, 88, 85. Give your answer to 2 decimal places
Answer: Mean = 58.14, Median = 54, Range = 66