Keystones — Capstone
Five GCSE retrieval questions · 24 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √960
Answer: 8√15 -
2. Algebra Completing the square
Complete the square: x² + 5x - 9
Answer: (x + 5⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 29cm, angle = 57°. Give your answer to 2 decimal places
Answer: 231.05cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 15:6:14 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 84, 34, 73, 39, 67, 84, 92. Give your answer to 2 decimal places
Answer: Mean = 68.38, Median = 73.5, Range = 58