Keystones — Capstone
Five GCSE retrieval questions · 22 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√27
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² - 9x + 10
Answer: (x - 9⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 15cm, angle = 79°. Give your answer to 2 decimal places
Answer: 184.06cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 36:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 33, 65, 25, 40, 64, 87, 92. Give your answer to 2 decimal places
Answer: Mean = 61.63, Median = 64.5, Range = 67