Keystones — Capstone
Five GCSE retrieval questions · 4 April 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √504
Answer: 6√14 -
2. Algebra Completing the square
Complete the square: 3x² + 24x - 12
Answer: 3(x + 4)² - 60 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 15cm, angle = 65°. Give your answer to 2 decimal places
Answer: 115.55cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 6:15:20 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 57, 99, 95, 63, 81, 92, 27. Give your answer to 2 decimal places
Answer: Mean = 68.63, Median = 72, Range = 72