Keystones — Capstone
Five GCSE retrieval questions · 11 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: 4x² + 48x + 5
Answer: 4(x + 6)² - 139 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 18cm, angle = 56°. Give your answer to 2 decimal places
Answer: 119.38cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 12:15:25 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 39, 33, 27, 84, 37, 53, 38, 22. Give your answer to 2 decimal places
Answer: Mean = 44.89, Median = 38, Range = 62