Keystones — Capstone
Five GCSE retrieval questions · 6 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: 4x² - 16x + 1
Answer: 4(x - 2)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 27cm, angle = 40°. Give your answer to 2 decimal places
Answer: 182.23cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 49:21:6 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 36, 53, 44, 58, 46, 51, 18, 73. Give your answer to 2 decimal places
Answer: Mean = 51.56, Median = 51, Range = 67