Keystones — Capstone
Five GCSE retrieval questions · 8 July 2014 · 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 + 9x + 2
Answer: (x + 9⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 15cm, angle = 62°. Give your answer to 2 decimal places
Answer: 158.93cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 12:21:28 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 31, 64, 32, 62, 14, 24, 29
Answer: Mean = 39, Median = 31.5, Range = 50