Keystones — Capstone
Five GCSE retrieval questions · 25 March 2013 · 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 - 30x + 10
Answer: 5(x - 3)² - 35 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 23cm, angle = 59°. Give your answer to 2 decimal places
Answer: 118.29cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 10:18:45 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 94, 29, 26, 36, 100, 58. Give your answer to 2 decimal places
Answer: Mean = 56.86, Median = 55, Range = 74