Keystones — Capstone
Five GCSE retrieval questions · 5 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√90
Answer: 12√10 -
2. Algebra Completing the square
Complete the square: x² - 5x - 8
Answer: (x - 5⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 20cm, angle = 64°. Give your answer to 2 decimal places
Answer: 116.84cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 35:45:72 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 84, 83, 67, 57, 36, 100, 44. Give your answer to 2 decimal places
Answer: Mean = 67.38, Median = 67.5, Range = 64