Keystones — Capstone
Five GCSE retrieval questions · 10 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√27
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: 4x² + 40x - 13
Answer: 4(x + 5)² - 113 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 14cm, angle = 48°. Give your answer to 2 decimal places
Answer: 145.66cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 72:45:40 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 42, 59, 30, 43, 29, 36. Give your answer to 2 decimal places
Answer: Mean = 43.86, Median = 42, Range = 39