Keystones — Capstone
Five GCSE retrieval questions · 4 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: x² - 11x + 12
Answer: (x - 11⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 24cm, angle = 40°. Give your answer to 2 decimal places
Answer: 115.7cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 49:35:40 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 20, 79, 61, 27, 33, 95, 87, 68. Give your answer to 2 decimal places
Answer: Mean = 61.67, Median = 68, Range = 75