Keystones — Capstone
Five GCSE retrieval questions · 16 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√80
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 5x² - 10x + 13
Answer: 5(x - 1)² + 8 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 27cm, angle = 41°. Give your answer to 2 decimal places
Answer: 239.13cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 2:14:21 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 88, 20, 45, 75, 99, 22, 68, 66. Give your answer to 2 decimal places
Answer: Mean = 56.44, Median = 66, Range = 79