Keystones — Capstone
Five GCSE retrieval questions · 12 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√90
Answer: 12√10 -
2. Algebra Completing the square
Complete the square: 5x² - 40x + 6
Answer: 5(x - 4)² - 74 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 23cm, angle = 44°. Give your answer to 2 decimal places
Answer: 175.75cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 54:63:14 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 54, 62, 42, 39, 35, 27, 39, 31. Give your answer to 2 decimal places
Answer: Mean = 43.67, Median = 39, Range = 37