Keystones — Capstone
Five GCSE retrieval questions · 5 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: x² - 5x + 8
Answer: (x - 5⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 30cm, angle = 77°. Give your answer to 2 decimal places
Answer: 438.47cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 64:72:63 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 38, 90, 10, 75, 63, 80, 97, 49. Give your answer to 2 decimal places
Answer: Mean = 56.89, Median = 63, Range = 87