Keystones — Capstone
Five GCSE retrieval questions · 6 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: 4x² - 8x - 7
Answer: 4(x - 1)² - 11 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 28cm, angle = 78°. Give your answer to 2 decimal places
Answer: 164.33cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 18:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 98, 91, 35, 14, 38, 62, 97, 80. Give your answer to 2 decimal places
Answer: Mean = 58.67, Median = 62, Range = 85