Keystones — Capstone
Five GCSE retrieval questions · 25 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√160
Answer: 20√10 -
2. Algebra Completing the square
Complete the square: 3x² + 6x - 2
Answer: 3(x + 1)² - 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 26cm, angle = 43°. Give your answer to 2 decimal places
Answer: 159.59cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 7:42:54 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 51, 46, 74, 73, 62, 67, 40, 77. Give your answer to 2 decimal places
Answer: Mean = 62.22, Median = 67, Range = 37