Keystones — Capstone
Five GCSE retrieval questions · 3 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√99
Answer: 12√11 -
2. Algebra Completing the square
Complete the square: 5x² - 10x - 9
Answer: 5(x - 1)² - 14 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 14cm, angle = 52°. Give your answer to 2 decimal places
Answer: 137.9cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 8:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 70, 29, 75, 40, 50, 83, 59, 95. Give your answer to 2 decimal places
Answer: Mean = 63.89, Median = 70, Range = 66