Keystones — Capstone
Five GCSE retrieval questions · 18 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 4x² - 40x + 3
Answer: 4(x - 5)² - 97 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 30cm, angle = 68°. Give your answer to 2 decimal places
Answer: 375.51cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 35:40:64 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 11, 83, 78, 31, 96, 31. Give your answer to 2 decimal places
Answer: Mean = 53.86, Median = 47, Range = 85