Keystones — Capstone
Five GCSE retrieval questions · 31 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√40
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: x² + 7x - 12
Answer: (x + 7⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 18cm, angle = 49°. Give your answer to 2 decimal places
Answer: 156.22cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 32:40:15 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 26, 84, 52, 13, 87, 88, 35
Answer: Mean = 52.25, Median = 43.5, Range = 75