Keystones — Capstone
Five GCSE retrieval questions · 21 March 2011 · 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 - 11
Answer: (x - 5⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 19cm, angle = 73°. Give your answer to 2 decimal places
Answer: 163.53cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 8:40:5 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 38, 95, 46, 73, 40, 82. Give your answer to 2 decimal places
Answer: Mean = 63.14, Median = 68, Range = 57