Keystones — Capstone
Five GCSE retrieval questions · 12 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √294
Answer: 7√6 -
2. Algebra Completing the square
Complete the square: 2x² - 24x + 15
Answer: 2(x - 6)² - 57 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 22cm, angle = 78°. Give your answer to 2 decimal places
Answer: 172.15cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 72:45:35 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 63, 63, 50, 45, 85, 76. Give your answer to 2 decimal places
Answer: Mean = 60.43, Median = 63, Range = 44