Keystones — Capstone
Five GCSE retrieval questions · 21 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: x² + 7x + 7
Answer: (x + 7⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 25cm, angle = 45°. Give your answer to 2 decimal places
Answer: 132.58cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 45:72:16 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 84, 93, 66, 10, 76, 48. Give your answer to 2 decimal places
Answer: Mean = 56.29, Median = 66, Range = 83