Keystones — Capstone
Five GCSE retrieval questions · 19 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √896
Answer: 8√14 -
2. Algebra Completing the square
Complete the square: 3x² + 36x - 15
Answer: 3(x + 6)² - 123 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 27cm, angle = 76°. Give your answer to 2 decimal places
Answer: 366.77cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 7:63:45 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 36, 59, 29, 54, 24, 15, 23. Give your answer to 2 decimal places
Answer: Mean = 34.38, Median = 32, Range = 44