Keystones — Capstone
Five GCSE retrieval questions · 17 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√90
Answer: 12√10 -
2. Algebra Completing the square
Complete the square: 4x² + 32x + 14
Answer: 4(x + 4)² - 50 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 15cm, angle = 72°. Give your answer to 2 decimal places
Answer: 128.39cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 18:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 60, 49, 69, 11, 24, 99. Give your answer to 2 decimal places
Answer: Mean = 55.43, Median = 60, Range = 88