Keystones — Capstone
Five GCSE retrieval questions · 23 December 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: 3x² - 18x - 14
Answer: 3(x - 3)² - 41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 17cm, angle = 63°. Give your answer to 2 decimal places
Answer: 143.9cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 12:15:20 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 86, 77, 10, 88, 85, 34, 87, 16. Give your answer to 2 decimal places
Answer: Mean = 64.11, Median = 85, Range = 84