Keystones — Capstone
Five GCSE retrieval questions · 17 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 5x² + 20x - 13
Answer: 5(x + 2)² - 33 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 18cm, angle = 40°. Give your answer to 2 decimal places
Answer: 121.49cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 45:10:6 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 38, 98, 53, 38, 26, 40. Give your answer to 2 decimal places
Answer: Mean = 51.86, Median = 40, Range = 72