Keystones — Capstone
Five GCSE retrieval questions · 1 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √80
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: x² - x - 3
Answer: (x - 1⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 12cm, angle = 78°. Give your answer to 2 decimal places
Answer: 117.38cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 49:35:45 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 22, 55, 75, 58, 10, 44. Give your answer to 2 decimal places
Answer: Mean = 49.14, Median = 55, Range = 70