Keystones — Capstone
Five GCSE retrieval questions · 23 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 4x² + 32x - 9
Answer: 4(x + 4)² - 73 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 18cm, angle = 63°. Give your answer to 2 decimal places
Answer: 232.55cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 7:21:6 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 49, 65, 63, 30, 40, 24, 50, 68. Give your answer to 2 decimal places
Answer: Mean = 54.22, Median = 50, Range = 75