Keystones — Capstone
Five GCSE retrieval questions · 1 February 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√125
Answer: 25√5 -
2. Algebra Completing the square
Complete the square: x² + 3x - 10
Answer: (x + 3⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 16cm, angle = 53°. Give your answer to 2 decimal places
Answer: 115cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 40:35:28 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 48, 73, 70, 38, 91, 86, 23, 19. Give your answer to 2 decimal places
Answer: Mean = 58.33, Median = 70, Range = 72