Keystones — Capstone
Five GCSE retrieval questions · 20 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√250
Answer: 25√10 -
2. Algebra Completing the square
Complete the square: x² - 9x - 9
Answer: (x - 9⁄2)² - 117⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 14cm, angle = 40°. Give your answer to 2 decimal places
Answer: 85.49cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 7:14:10 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 41, 44, 11, 91, 30, 25, 82, 13. Give your answer to 2 decimal places
Answer: Mean = 42.56, Median = 41, Range = 80