Keystones — Capstone
Five GCSE retrieval questions · 1 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: 3x² - 6x - 2
Answer: 3(x - 1)² - 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 29cm, angle = 53°. Give your answer to 2 decimal places
Answer: 138.96cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 20:36:63 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 25, 45, 17, 39, 53, 98, 69, 28. Give your answer to 2 decimal places
Answer: Mean = 51.44, Median = 45, Range = 81