Keystones — Capstone
Five GCSE retrieval questions · 31 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √600
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: 4x² - 40x - 14
Answer: 4(x - 5)² - 114 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 14cm, angle = 60°. Give your answer to 2 decimal places
Answer: 121.24cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 16:56:63 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 25, 53, 49, 65, 22, 89, 84, 23. Give your answer to 2 decimal places
Answer: Mean = 52.78, Median = 53, Range = 67