Keystones — Capstone
Five GCSE retrieval questions · 17 January 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 + 7x + 11
Answer: (x + 7⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 20cm, angle = 42°. Give your answer to 2 decimal places
Answer: 153.9cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 28:20:35 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 65, 24, 81, 82, 24, 72, 30, 55. Give your answer to 2 decimal places
Answer: Mean = 52.56, Median = 55, Range = 58