Keystones — Capstone
Five GCSE retrieval questions · 6 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: 5x² + 20x + 2
Answer: 5(x + 2)² - 18 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 30cm, angle = 47°. Give your answer to 2 decimal places
Answer: 186.5cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 25:40:72 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 18, 88, 20, 42, 75, 27, 62
Answer: Mean = 43.75, Median = 34.5, Range = 70