Keystones — Capstone
Five GCSE retrieval questions · 27 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 - 24x - 7
Answer: 3(x - 4)² - 55 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 22cm, angle = 46°. Give your answer to 2 decimal places
Answer: 102.87cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 35:28:32 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 97, 74, 86, 21, 84, 40. Give your answer to 2 decimal places
Answer: Mean = 65.14, Median = 74, Range = 76