Keystones — Capstone
Five GCSE retrieval questions · 20 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: 4x² + 16x + 9
Answer: 4(x + 2)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 20cm, angle = 61°. Give your answer to 2 decimal places
Answer: 192.42cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 81:63:35 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 14, 59, 51, 80, 90, 41, 89
Answer: Mean = 63.75, Median = 69.5, Range = 76