Keystones — Capstone
Five GCSE retrieval questions · 6 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√150
Answer: 15√6 -
2. Algebra Completing the square
Complete the square: x² - x + 5
Answer: (x - 1⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 24cm, angle = 41°. Give your answer to 2 decimal places
Answer: 196.82cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 35:30:24 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 84, 44, 96, 44, 96, 74. Give your answer to 2 decimal places
Answer: Mean = 66.14, Median = 74, Range = 71