Keystones — Capstone
Five GCSE retrieval questions · 19 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: 4x² - 32x - 12
Answer: 4(x - 4)² - 76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 18cm, angle = 76°. Give your answer to 2 decimal places
Answer: 218.32cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 9:36:4 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 32, 49, 97, 56, 77, 68, 61, 73. Give your answer to 2 decimal places
Answer: Mean = 63.56, Median = 61, Range = 65