Keystones — Capstone
Five GCSE retrieval questions · 20 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √432
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: 3x² + 18x + 12
Answer: 3(x + 3)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 12cm, angle = 64°. Give your answer to 2 decimal places
Answer: 75.5cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 36:63:14 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 63, 22, 81, 77, 55, 37. Give your answer to 2 decimal places
Answer: Mean = 57.43, Median = 63, Range = 59