Keystones — Capstone
Five GCSE retrieval questions · 5 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √637
Answer: 7√13 -
2. Algebra Completing the square
Complete the square: 5x² - 50x + 9
Answer: 5(x - 5)² - 116 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 22cm, angle = 68°. Give your answer to 2 decimal places
Answer: 132.59cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 8:14:35 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 17, 81, 52, 21, 19, 48. Give your answer to 2 decimal places
Answer: Mean = 44.57, Median = 48, Range = 64