Keystones — Capstone
Five GCSE retrieval questions · 7 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: 2x² - 16x - 9
Answer: 2(x - 4)² - 41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 30cm, angle = 61°. Give your answer to 2 decimal places
Answer: 262.39cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 12:20:15 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 67, 19, 99, 18, 65, 38, 77, 68. Give your answer to 2 decimal places
Answer: Mean = 51.33, Median = 65, Range = 88