Keystones — Capstone
Five GCSE retrieval questions · 20 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: 5x² - 50x - 3
Answer: 5(x - 5)² - 128 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 24cm, angle = 68°. Give your answer to 2 decimal places
Answer: 133.51cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 35:20:28 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 69, 82, 98, 79, 71, 16, 40, 95. Give your answer to 2 decimal places
Answer: Mean = 63.78, Median = 71, Range = 82