Keystones — Capstone
Five GCSE retrieval questions · 22 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√12
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² - 9x - 6
Answer: (x - 9⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 15cm, angle = 55°. Give your answer to 2 decimal places
Answer: 104.44cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 28:63:9 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 49, 74, 13, 31, 90, 40, 34
Answer: Mean = 49, Median = 44.5, Range = 77