Keystones — Capstone
Five GCSE retrieval questions · 16 October 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √504
Answer: 6√14 -
2. Algebra Completing the square
Complete the square: 3x² + 30x - 10
Answer: 3(x + 5)² - 85 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 25cm, angle = 61°. Give your answer to 2 decimal places
Answer: 131.19cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 3:21:28 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 18, 60, 79, 92, 83, 46, 74, 82. Give your answer to 2 decimal places
Answer: Mean = 61.22, Median = 74, Range = 75