Keystones — Capstone
Five GCSE retrieval questions · 2 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: x² - 9x - 6
Answer: (x - 9⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 21cm, angle = 70°. Give your answer to 2 decimal places
Answer: 197.34cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 9:6:16 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 89, 97, 34, 31, 26, 10. Give your answer to 2 decimal places
Answer: Mean = 42.57, Median = 31, Range = 87