Keystones — Capstone
Five GCSE retrieval questions · 24 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √726
Answer: 11√6 -
2. Algebra Completing the square
Complete the square: 5x² - 10x - 15
Answer: 5(x - 1)² - 20 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 29cm, angle = 64°. Give your answer to 2 decimal places
Answer: 364.91cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 2:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 81, 13, 58, 28, 76, 80, 16, 80. Give your answer to 2 decimal places
Answer: Mean = 52.56, Median = 58, Range = 68