Keystones — Capstone
Five GCSE retrieval questions · 28 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√28
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: x² - 5x + 9
Answer: (x - 5⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 12cm, angle = 57°. Give your answer to 2 decimal places
Answer: 90.58cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 27:36:8 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 14, 72, 56, 76, 43, 98, 43. Give your answer to 2 decimal places
Answer: Mean = 58.13, Median = 59.5, Range = 84