Keystones — Capstone
Five GCSE retrieval questions · 25 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √96
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: x² - 9x - 8
Answer: (x - 9⁄2)² - 113⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 12cm, angle = 42°. Give your answer to 2 decimal places
Answer: 92.34cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 35:45:18 -
5. Statistics Averages and range
Find the mean, median and range of: 66, 28, 62, 53, 40, 66, 94. Give your answer to 2 decimal places
Answer: Mean = 58.43, Median = 62, Range = 66