Keystones — Capstone
Five GCSE retrieval questions · 18 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: 2x² + 12x - 8
Answer: 2(x + 3)² - 26 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 22cm, angle = 49°. Give your answer to 2 decimal places
Answer: 207.55cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 20:15:6 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 79, 18, 26, 85, 100, 68, 48. Give your answer to 2 decimal places
Answer: Mean = 61.13, Median = 66.5, Range = 82