Keystones — Capstone
Five GCSE retrieval questions · 2 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √405
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: 3x² + 24x - 10
Answer: 3(x + 4)² - 58 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 18cm, angle = 69°. Give your answer to 2 decimal places
Answer: 117.63cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 54:63:14 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 90, 10, 81, 43, 96, 21. Give your answer to 2 decimal places
Answer: Mean = 58.71, Median = 70, Range = 86