Keystones — Capstone
Five GCSE retrieval questions · 14 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√160
Answer: 16√10 -
2. Algebra Completing the square
Complete the square: x² + 11x
Answer: (x + 11⁄2)² - 121⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 12cm, angle = 50°. Give your answer to 2 decimal places
Answer: 119.5cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 27:12:10 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 31, 56, 30, 54, 26, 83, 20. Give your answer to 2 decimal places
Answer: Mean = 47.88, Median = 42.5, Range = 63