Keystones — Capstone
Five GCSE retrieval questions · 10 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√125
Answer: 25√5 -
2. Algebra Completing the square
Complete the square: x² + x - 5
Answer: (x + 1⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 29cm, angle = 63°. Give your answer to 2 decimal places
Answer: 374.67cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 64:72:45 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 72, 49, 15, 72, 14, 91, 35. Give your answer to 2 decimal places
Answer: Mean = 46.38, Median = 42, Range = 77