Keystones — Capstone
Five GCSE retrieval questions · 24 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√54
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: 3x² + 24x + 5
Answer: 3(x + 4)² - 43 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 27cm, angle = 61°. Give your answer to 2 decimal places
Answer: 318.8cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 6:30:35 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 52, 24, 61, 91, 26, 42. Give your answer to 2 decimal places
Answer: Mean = 56.57, Median = 52, Range = 76