Keystones — Capstone
Five GCSE retrieval questions · 25 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: 5x² - 10x + 9
Answer: 5(x - 1)² + 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 24cm, angle = 75°. Give your answer to 2 decimal places
Answer: 324.55cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 21:56:32 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 54, 93, 27, 59, 92, 67
Answer: Mean = 59, Median = 59, Range = 72