Keystones — Capstone
Five GCSE retrieval questions · 7 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: x² - 5x - 3
Answer: (x - 5⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 29cm, angle = 59°. Give your answer to 2 decimal places
Answer: 310.72cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 2:12:3 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 22, 93, 41, 84, 10, 26, 93. Give your answer to 2 decimal places
Answer: Mean = 58.38, Median = 62.5, Range = 88