Keystones — Capstone
Five GCSE retrieval questions · 22 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √486
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: x² - 7x - 2
Answer: (x - 7⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 13cm, angle = 56°. Give your answer to 2 decimal places
Answer: 134.72cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 28:20:35 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 56, 91, 88, 74, 11, 10, 66, 72. Give your answer to 2 decimal places
Answer: Mean = 60.56, Median = 72, Range = 81