Keystones — Capstone
Five GCSE retrieval questions · 26 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√50
Answer: 25√2 -
2. Algebra Completing the square
Complete the square: x² - 11x + 2
Answer: (x - 11⁄2)² - 113⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 14cm, angle = 53°. Give your answer to 2 decimal places
Answer: 156.53cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 15:21:35 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 16, 94, 93, 32, 60, 46, 91
Answer: Mean = 57.25, Median = 53, Range = 78