Keystones — Capstone
Five GCSE retrieval questions · 26 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √896
Answer: 8√14 -
2. Algebra Completing the square
Complete the square: x² - 5x + 1
Answer: (x - 5⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 23cm, angle = 53°. Give your answer to 2 decimal places
Answer: 146.95cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 63:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 44, 68, 19, 42, 98, 66, 99, 27. Give your answer to 2 decimal places
Answer: Mean = 59.67, Median = 66, Range = 80