Keystones — Capstone
Five GCSE retrieval questions · 24 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √720
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 3x² - 18x + 11
Answer: 3(x - 3)² - 16 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 24cm, angle = 49°. Give your answer to 2 decimal places
Answer: 163.02cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 40:45:54 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 25, 43, 68, 78, 43, 85. Give your answer to 2 decimal places
Answer: Mean = 60.86, Median = 68, Range = 60