Keystones — Capstone
Five GCSE retrieval questions · 4 June 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 - x - 9
Answer: (x - 1⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 29cm, angle = 49°. Give your answer to 2 decimal places
Answer: 196.98cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 35:63:27 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 39, 97, 81, 44, 80, 85, 63, 51. Give your answer to 2 decimal places
Answer: Mean = 65.33, Median = 63, Range = 58