Keystones — Capstone
Five GCSE retrieval questions · 2 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√48
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: 4x² - 32x
Answer: 4(x - 4)² - 64 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 18cm, angle = 70°. Give your answer to 2 decimal places
Answer: 253.72cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 36:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 40, 70, 91, 19, 48, 99. Give your answer to 2 decimal places
Answer: Mean = 56.14, Median = 48, Range = 80