Keystones — Capstone
Five GCSE retrieval questions · 25 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: 5x² - 50x + 15
Answer: 5(x - 5)² - 110 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 18cm, angle = 67°. Give your answer to 2 decimal places
Answer: 124.27cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 28:21:15 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 81, 35, 43, 47, 31, 11, 15, 37. Give your answer to 2 decimal places
Answer: Mean = 37.67, Median = 37, Range = 70