Keystones — Capstone
Five GCSE retrieval questions · 8 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√250
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: x² - x - 5
Answer: (x - 1⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 26cm, angle = 66°. Give your answer to 2 decimal places
Answer: 213.77cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 12:30:25 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 64, 95, 25, 61, 33, 16, 21
Answer: Mean = 43, Median = 31, Range = 79