Keystones — Capstone
Five GCSE retrieval questions · 7 March 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √735
Answer: 7√15 -
2. Algebra Completing the square
Complete the square: 5x² - 40x + 11
Answer: 5(x - 4)² - 69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 18cm, angle = 72°. Give your answer to 2 decimal places
Answer: 145.51cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 9:18:16 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 57, 74, 52, 42, 35, 20, 14, 66. Give your answer to 2 decimal places
Answer: Mean = 50.33, Median = 52, Range = 79