Keystones — Capstone
Five GCSE retrieval questions · 22 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: 3x² - 18x - 10
Answer: 3(x - 3)² - 37 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 19cm, angle = 77°. Give your answer to 2 decimal places
Answer: 185.13cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 49:21:12 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 53, 64, 19, 71, 87, 87. Give your answer to 2 decimal places
Answer: Mean = 59.14, Median = 64, Range = 68