Keystones — Capstone
Five GCSE retrieval questions · 19 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: 4x² + 32x - 13
Answer: 4(x + 4)² - 77 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 26cm, angle = 52°. Give your answer to 2 decimal places
Answer: 204.88cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 40:35:21 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 31, 45, 29, 57, 68, 49, 35. Give your answer to 2 decimal places
Answer: Mean = 47.88, Median = 47, Range = 40