Keystones — Capstone
Five GCSE retrieval questions · 5 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√250
Answer: 15√10 -
2. Algebra Completing the square
Complete the square: x² + 5x - 9
Answer: (x + 5⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 18cm, angle = 56°. Give your answer to 2 decimal places
Answer: 141.77cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 14:63:45 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 68, 33, 100, 83, 22, 61, 13, 98. Give your answer to 2 decimal places
Answer: Mean = 55.78, Median = 61, Range = 87