Keystones — Capstone
Five GCSE retrieval questions · 17 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√112
Answer: 16√7 -
2. Algebra Completing the square
Complete the square: 3x² - 12x - 13
Answer: 3(x - 2)² - 25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 14cm, angle = 48°. Give your answer to 2 decimal places
Answer: 62.42cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 16:56:21 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 56, 68, 29, 78, 78, 82. Give your answer to 2 decimal places
Answer: Mean = 64.57, Median = 68, Range = 53