Keystones — Capstone
Five GCSE retrieval questions · 18 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√20
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: x² - x + 8
Answer: (x - 1⁄2)² + 31⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 13cm, angle = 73°. Give your answer to 2 decimal places
Answer: 74.59cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 35:28:32 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 66, 54, 87, 77, 89, 31, 85, 68. Give your answer to 2 decimal places
Answer: Mean = 70.56, Median = 77, Range = 58