Keystones — Capstone
Five GCSE retrieval questions · 23 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√75
Answer: 15√3 -
2. Algebra Completing the square
Complete the square: 4x² - 8x + 8
Answer: 4(x - 1)² + 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 14cm, angle = 70°. Give your answer to 2 decimal places
Answer: 111.82cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 28:36:9 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 84, 49, 44, 73, 37, 67, 70, 30. Give your answer to 2 decimal places
Answer: Mean = 60.56, Median = 67, Range = 61