Keystones — Capstone
Five GCSE retrieval questions · 5 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √756
Answer: 6√21 -
2. Algebra Completing the square
Complete the square: 5x² - 50x + 7
Answer: 5(x - 5)² - 118 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 13cm, angle = 66°. Give your answer to 2 decimal places
Answer: 89.07cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 9:6:2 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 100, 36, 54, 90, 38, 75, 32. Give your answer to 2 decimal places
Answer: Mean = 54.88, Median = 46, Range = 86