Keystones — Capstone
Five GCSE retrieval questions · 14 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√80
Answer: 20√5 -
2. Algebra Completing the square
Complete the square: x² - 9x - 5
Answer: (x - 9⁄2)² - 101⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 30cm, angle = 57°. Give your answer to 2 decimal places
Answer: 301.92cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 18:10:5 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 73, 73, 68, 59, 27, 52, 74
Answer: Mean = 63.25, Median = 70.5, Range = 53