Keystones — Capstone
Five GCSE retrieval questions · 18 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √896
Answer: 8√14 -
2. Algebra Completing the square
Complete the square: 3x² + 36x + 4
Answer: 3(x + 6)² - 104 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 18cm, angle = 61°. Give your answer to 2 decimal places
Answer: 157.43cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 27:72:40 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 75, 14, 78, 42, 33, 83, 97, 67. Give your answer to 2 decimal places
Answer: Mean = 62.56, Median = 74, Range = 83