Keystones — Capstone
Five GCSE retrieval questions · 23 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: x² - 3x + 11
Answer: (x - 3⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 18cm, angle = 48°. Give your answer to 2 decimal places
Answer: 133.77cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 21:12:16 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 84, 54, 87, 58, 60, 70. Give your answer to 2 decimal places
Answer: Mean = 62.14, Median = 60, Range = 65