Keystones — Capstone
Five GCSE retrieval questions · 14 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: x² - 11x - 2
Answer: (x - 11⁄2)² - 129⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 29cm, angle = 54°. Give your answer to 2 decimal places
Answer: 316.73cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 21:28:16 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 58, 17, 21, 70, 35, 54, 48, 92. Give your answer to 2 decimal places
Answer: Mean = 51.33, Median = 54, Range = 75