Keystones — Capstone
Five GCSE retrieval questions · 23 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √540
Answer: 6√15 -
2. Algebra Completing the square
Complete the square: 4x² - 24x - 5
Answer: 4(x - 3)² - 41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 22cm, angle = 74°. Give your answer to 2 decimal places
Answer: 126.89cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 54:42:35 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 53, 53, 17, 57, 34, 80, 80. Give your answer to 2 decimal places
Answer: Mean = 59.13, Median = 55, Range = 82