Keystones — Capstone
Five GCSE retrieval questions · 10 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√27
Answer: 15√3 -
2. Algebra Completing the square
Complete the square: 4x² + 48x + 1
Answer: 4(x + 6)² - 143 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 27cm, angle = 78°. Give your answer to 2 decimal places
Answer: 198.07cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 20:36:27 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 12, 40, 98, 34, 53, 16. Give your answer to 2 decimal places
Answer: Mean = 41.14, Median = 35, Range = 86