Keystones — Capstone
Five GCSE retrieval questions · 18 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √300
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 5x² + 50x + 5
Answer: 5(x + 5)² - 120 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 20cm, angle = 75°. Give your answer to 2 decimal places
Answer: 115.91cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 7:14:12 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 27, 54, 25, 72, 37, 60, 43, 88. Give your answer to 2 decimal places
Answer: Mean = 53.22, Median = 54, Range = 63