Keystones — Capstone
Five GCSE retrieval questions · 14 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: 2x² + 12x - 2
Answer: 2(x + 3)² - 20 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 18cm, angle = 58°. Give your answer to 2 decimal places
Answer: 221.34cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 49:14:18 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 32, 88, 41, 47, 21, 56. Give your answer to 2 decimal places
Answer: Mean = 43.29, Median = 41, Range = 70