Keystones — Capstone
Five GCSE retrieval questions · 28 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² - 3x - 10
Answer: (x - 3⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 23cm, angle = 70°. Give your answer to 2 decimal places
Answer: 205.32cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 10:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 55, 42, 92, 51, 88, 49, 66, 77. Give your answer to 2 decimal places
Answer: Mean = 68.33, Median = 66, Range = 53