Keystones — Capstone
Five GCSE retrieval questions · 30 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: x² - 3x + 8
Answer: (x - 3⁄2)² + 23⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 27cm, angle = 56°. Give your answer to 2 decimal places
Answer: 167.88cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 4:20:5 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 89, 10, 29, 18, 81, 58. Give your answer to 2 decimal places
Answer: Mean = 44.43, Median = 29, Range = 79