Keystones — Capstone
Five GCSE retrieval questions · 4 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√80
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 4x² - 32x - 14
Answer: 4(x - 4)² - 78 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 22cm, angle = 67°. Give your answer to 2 decimal places
Answer: 202.51cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 5:10:8 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 12, 27, 80, 25, 78, 86, 17, 70. Give your answer to 2 decimal places
Answer: Mean = 49.89, Median = 54, Range = 74