Keystones — Capstone
Five GCSE retrieval questions · 13 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√27
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: 3x² - 24x + 2
Answer: 3(x - 4)² - 46 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 23cm, angle = 79°. Give your answer to 2 decimal places
Answer: 282.22cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 9:63:56 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 23, 70, 55, 52, 48, 54, 87, 86. Give your answer to 2 decimal places
Answer: Mean = 62.89, Median = 55, Range = 68