Keystones — Capstone
Five GCSE retrieval questions · 11 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √720
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 4x² - 16x + 12
Answer: 4(x - 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 25cm, angle = 46°. Give your answer to 2 decimal places
Answer: 269.75cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 6:10:15 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 67, 70, 93, 69, 29, 76, 40, 38. Give your answer to 2 decimal places
Answer: Mean = 60.78, Median = 67, Range = 64