Keystones — Capstone
Five GCSE retrieval questions · 14 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
2. Algebra Completing the square
Complete the square: x² - 9x - 11
Answer: (x - 9⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 28cm, angle = 45°. Give your answer to 2 decimal places
Answer: 296.98cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 21:12:2 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 25, 88, 26, 49, 18, 69. Give your answer to 2 decimal places
Answer: Mean = 50.57, Median = 49, Range = 70