Keystones — Capstone
Five GCSE retrieval questions · 9 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√75
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 4x² - 40x - 15
Answer: 4(x - 5)² - 115 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 27cm, angle = 76°. Give your answer to 2 decimal places
Answer: 235.78cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 25:45:18 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 24, 46, 19, 45, 44, 95, 58. Give your answer to 2 decimal places
Answer: Mean = 47.38, Median = 45.5, Range = 76