Keystones — Capstone
Five GCSE retrieval questions · 5 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √847
Answer: 11√7 -
2. Algebra Completing the square
Complete the square: 2x² - 4x + 6
Answer: 2(x - 1)² + 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 24cm, angle = 54°. Give your answer to 2 decimal places
Answer: 174.75cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 14:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 84, 79, 72, 25, 87, 18, 68, 84. Give your answer to 2 decimal places
Answer: Mean = 68.11, Median = 79, Range = 78