Keystones — Capstone
Five GCSE retrieval questions · 12 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√40
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² + 11x - 1
Answer: (x + 11⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 26cm, angle = 63°. Give your answer to 2 decimal places
Answer: 324.33cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 21:15:10 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 74, 42, 40, 19, 82, 80. Give your answer to 2 decimal places
Answer: Mean = 61.29, Median = 74, Range = 73