Keystones — Capstone
Five GCSE retrieval questions · 10 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√175
Answer: 25√7 -
2. Algebra Completing the square
Complete the square: 3x² - 6x + 8
Answer: 3(x - 1)² + 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 14cm, angle = 64°. Give your answer to 2 decimal places
Answer: 88.08cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 45:63:56 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 69, 70, 76, 66, 99, 60, 23, 10. Give your answer to 2 decimal places
Answer: Mean = 54.56, Median = 66, Range = 89