Keystones — Capstone
Five GCSE retrieval questions · 27 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √360
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: x² + 9x + 1
Answer: (x + 9⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 28cm, angle = 52°. Give your answer to 2 decimal places
Answer: 198.58cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 10:14:21 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 28, 28, 70, 51, 37, 55. Give your answer to 2 decimal places
Answer: Mean = 40.29, Median = 37, Range = 57