Keystones — Capstone
Five GCSE retrieval questions · 1 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: 5x² + 10x - 1
Answer: 5(x + 1)² - 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 15cm, angle = 42°. Give your answer to 2 decimal places
Answer: 115.43cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 81:36:4 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 88, 51, 76, 28, 82, 79, 45, 65. Give your answer to 2 decimal places
Answer: Mean = 65.11, Median = 72, Range = 60