Keystones — Capstone
Five GCSE retrieval questions · 17 October 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √96
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: x² - 9x + 2
Answer: (x - 9⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 24cm, angle = 56°. Give your answer to 2 decimal places
Answer: 119.38cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 12:20:25 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 82, 41, 55, 20, 11, 56. Give your answer to 2 decimal places
Answer: Mean = 41.86, Median = 41, Range = 71