Keystones — Capstone
Five GCSE retrieval questions · 4 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√45
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: 3x² - 12x - 11
Answer: 3(x - 2)² - 23 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 26cm, angle = 48°. Give your answer to 2 decimal places
Answer: 251.18cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 7:14:6 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 77, 87, 67, 95, 86, 75, 50, 48. Give your answer to 2 decimal places
Answer: Mean = 72.67, Median = 75, Range = 47