Keystones — Capstone
Five GCSE retrieval questions · 24 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√27
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: 3x² + 18x - 14
Answer: 3(x + 3)² - 41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 27cm, angle = 41°. Give your answer to 2 decimal places
Answer: 132.85cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 64:24:21 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 37, 65, 76, 78, 97, 22. Give your answer to 2 decimal places
Answer: Mean = 64.29, Median = 75, Range = 75