Keystones — Capstone
Five GCSE retrieval questions · 24 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √294
Answer: 7√6 -
2. Algebra Completing the square
Complete the square: x² - 3x - 8
Answer: (x - 3⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 18cm, angle = 42°. Give your answer to 2 decimal places
Answer: 120.44cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 14:10:35 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 10, 48, 69, 63, 71, 33, 82
Answer: Mean = 56.5, Median = 66, Range = 72