Keystones — Capstone
Five GCSE retrieval questions · 27 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: 5x² + 10x - 4
Answer: 5(x + 1)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 28cm, angle = 79°. Give your answer to 2 decimal places
Answer: 316.08cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 7:63:9 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 92, 78, 21, 13, 34, 88, 92, 68. Give your answer to 2 decimal places
Answer: Mean = 62.89, Median = 78, Range = 79