Keystones — Capstone
Five GCSE retrieval questions · 13 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √80
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: x² + 9x + 1
Answer: (x + 9⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 13cm, angle = 49°. Give your answer to 2 decimal places
Answer: 137.36cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 3:21:14 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 98, 76, 11, 71, 89, 16. Give your answer to 2 decimal places
Answer: Mean = 59.86, Median = 71, Range = 87