Keystones — Capstone
Five GCSE retrieval questions · 3 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √833
Answer: 7√17 -
2. Algebra Completing the square
Complete the square: 5x² - 50x + 5
Answer: 5(x - 5)² - 120 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 12cm, angle = 64°. Give your answer to 2 decimal places
Answer: 70.11cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 36:63:14 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 91, 80, 43, 47, 80, 93. Give your answer to 2 decimal places
Answer: Mean = 65.29, Median = 80, Range = 70