Keystones — Capstone
Five GCSE retrieval questions · 22 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: 2x² + 16x - 13
Answer: 2(x + 4)² - 45 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 25cm, angle = 61°. Give your answer to 2 decimal places
Answer: 207.72cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 36:42:35 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 81, 60, 23, 85, 68, 98. Give your answer to 2 decimal places
Answer: Mean = 65.71, Median = 68, Range = 75