Keystones — Capstone
Five GCSE retrieval questions · 21 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √448
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² - 5x + 6
Answer: (x - 5⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 13cm, angle = 53°. Give your answer to 2 decimal places
Answer: 77.87cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 9:6:8 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 60, 19, 62, 17, 83, 69, 35, 55. Give your answer to 2 decimal places
Answer: Mean = 53.33, Median = 60, Range = 66