Keystones — Capstone
Five GCSE retrieval questions · 11 July 2015 · 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 - 12
Answer: (x - 3⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 13cm, angle = 68°. Give your answer to 2 decimal places
Answer: 108.48cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 15:20:28 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 20, 33, 48, 88, 83, 38, 17, 48. Give your answer to 2 decimal places
Answer: Mean = 51.67, Median = 48, Range = 73