Keystones — Capstone
Five GCSE retrieval questions · 3 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 5x² - 50x
Answer: 5(x - 5)² - 125 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 24cm, angle = 65°. Give your answer to 2 decimal places
Answer: 293.64cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 36:30:5 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 89, 55, 95, 54, 11, 27. Give your answer to 2 decimal places
Answer: Mean = 51.86, Median = 54, Range = 84