Keystones — Capstone
Five GCSE retrieval questions · 13 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√20
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - 3x - 1
Answer: (x - 3⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 15cm, angle = 47°. Give your answer to 2 decimal places
Answer: 126.16cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 20:15:6 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 73, 61, 19, 34, 82, 44. Give your answer to 2 decimal places
Answer: Mean = 58.86, Median = 61, Range = 80