Keystones — Capstone
Five GCSE retrieval questions · 15 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √704
Answer: 8√11 -
2. Algebra Completing the square
Complete the square: x² - 9x + 8
Answer: (x - 9⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 16cm, angle = 49°. Give your answer to 2 decimal places
Answer: 108.68cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 20:45:81 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 34, 45, 92, 20, 62, 41. Give your answer to 2 decimal places
Answer: Mean = 44.14, Median = 41, Range = 77