Keystones — Capstone
Five GCSE retrieval questions · 4 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: 4x² + 40x - 6
Answer: 4(x + 5)² - 106 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 25cm, angle = 56°. Give your answer to 2 decimal places
Answer: 269.44cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 35:56:32 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 79, 69, 15, 24, 73, 92. Give your answer to 2 decimal places
Answer: Mean = 52.71, Median = 69, Range = 77