Keystones — Capstone
Five GCSE retrieval questions · 17 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√160
Answer: 20√10 -
2. Algebra Completing the square
Complete the square: 4x² - 32x - 1
Answer: 4(x - 4)² - 65 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 17cm, angle = 72°. Give your answer to 2 decimal places
Answer: 218.27cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 27:45:25 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 29, 73, 81, 14, 33, 33, 72. Give your answer to 2 decimal places
Answer: Mean = 50.88, Median = 52.5, Range = 67