Keystones — Capstone
Five GCSE retrieval questions · 6 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √605
Answer: 11√5 -
2. Algebra Completing the square
Complete the square: 5x² - 30x + 5
Answer: 5(x - 3)² - 40 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 28cm, angle = 77°. Give your answer to 2 decimal places
Answer: 395.59cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 5:35:14 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 82, 38, 69, 11, 50, 35. Give your answer to 2 decimal places
Answer: Mean = 42.86, Median = 38, Range = 71