Keystones — Capstone
Five GCSE retrieval questions · 30 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 3x² + 18x + 12
Answer: 3(x + 3)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 14cm, angle = 67°. Give your answer to 2 decimal places
Answer: 109.54cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 48:40:25 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 30, 79, 86, 38, 58, 80. Give your answer to 2 decimal places
Answer: Mean = 62.29, Median = 65, Range = 56