Keystones — Capstone
Five GCSE retrieval questions · 24 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: 5x² - 40x - 13
Answer: 5(x - 4)² - 93 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 19cm, angle = 77°. Give your answer to 2 decimal places
Answer: 129.59cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 21:28:4 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 30, 28, 36, 89, 40, 60. Give your answer to 2 decimal places
Answer: Mean = 54.57, Median = 40, Range = 71