Keystones — Capstone
Five GCSE retrieval questions · 12 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√176
Answer: 8√11 -
2. Algebra Completing the square
Complete the square: 5x² + 20x - 9
Answer: 5(x + 2)² - 29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 15cm, angle = 50°. Give your answer to 2 decimal places
Answer: 149.38cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 16:28:21 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 49, 43, 40, 30, 68, 34, 73
Answer: Mean = 44.75, Median = 41.5, Range = 52