Keystones — Capstone
Five GCSE retrieval questions · 27 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√48
Answer: 16√3 -
2. Algebra Completing the square
Complete the square: x² + 11x + 9
Answer: (x + 11⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 15cm, angle = 60°. Give your answer to 2 decimal places
Answer: 188.36cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 8:40:25 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 93, 86, 72, 40, 13, 36, 48, 51. Give your answer to 2 decimal places
Answer: Mean = 58.33, Median = 51, Range = 80