Keystones — Capstone
Five GCSE retrieval questions · 25 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √216
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: x² - 9x + 10
Answer: (x - 9⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 18cm, angle = 51°. Give your answer to 2 decimal places
Answer: 111.91cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 25:10:8 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 72, 17, 65, 92, 18, 82, 64. Give your answer to 2 decimal places
Answer: Mean = 62.13, Median = 68.5, Range = 75