Keystones — Capstone
Five GCSE retrieval questions · 21 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: 5x² - 50x + 9
Answer: 5(x - 5)² - 116 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 14cm, angle = 50°. Give your answer to 2 decimal places
Answer: 85.8cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 27:6:14 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 83, 68, 88, 96, 80, 80. Give your answer to 2 decimal places
Answer: Mean = 81.57, Median = 80, Range = 28