Keystones — Capstone
Five GCSE retrieval questions · 25 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 5x - 2
Answer: (x + 5⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 26cm, angle = 40°. Give your answer to 2 decimal places
Answer: 142.06cm² -
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: 99, 15, 80, 80, 13, 30, 43, 29. Give your answer to 2 decimal places
Answer: Mean = 48.63, Median = 36.5, Range = 86