Keystones — Capstone
Five GCSE retrieval questions · 6 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √294
Answer: 7√6 -
2. Algebra Completing the square
Complete the square: x² + 7x + 7
Answer: (x + 7⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 12cm, angle = 78°. Give your answer to 2 decimal places
Answer: 152.59cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 45:10:14 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 30, 77, 50, 98, 57, 48, 98. Give your answer to 2 decimal places
Answer: Mean = 60.88, Median = 53.5, Range = 69