Keystones — Capstone
Five GCSE retrieval questions · 17 February 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: 4x² - 40x - 5
Answer: 4(x - 5)² - 105 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 26cm, angle = 44°. Give your answer to 2 decimal places
Answer: 171.58cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 64:56:7 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 85, 17, 68, 50, 11, 69, 35, 11
Answer: Mean = 43, Median = 41, Range = 74