Keystones — Capstone
Five GCSE retrieval questions · 12 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √176
Answer: 4√11 -
2. Algebra Completing the square
Complete the square: 3x² - 12x + 9
Answer: 3(x - 2)² - 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 21cm, angle = 48°. Give your answer to 2 decimal places
Answer: 171.67cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 56:24:15 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 25, 76, 67, 64, 89, 14, 86. Give your answer to 2 decimal places
Answer: Mean = 62.38, Median = 71.5, Range = 75