Keystones — Capstone
Five GCSE retrieval questions · 30 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √432
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: 2x² - 8x + 15
Answer: 2(x - 2)² + 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 29cm, angle = 72°. Give your answer to 2 decimal places
Answer: 317.18cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 15:21:56 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 100, 47, 25, 37, 53, 60. Give your answer to 2 decimal places
Answer: Mean = 59.86, Median = 53, Range = 75