Keystones — Capstone
Five GCSE retrieval questions · 14 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√80
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: x² - 5x + 5
Answer: (x - 5⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 15cm, angle = 45°. Give your answer to 2 decimal places
Answer: 74.25cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 9:21:14 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 14, 40, 36, 24, 71, 41. Give your answer to 2 decimal places
Answer: Mean = 37.29, Median = 36, Range = 57