Keystones — Capstone
Five GCSE retrieval questions · 25 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√90
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: x² - 3x - 11
Answer: (x - 3⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 20cm, angle = 63°. Give your answer to 2 decimal places
Answer: 142.56cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 16:24:9 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 37, 76, 73, 60, 63, 96, 84. Give your answer to 2 decimal places
Answer: Mean = 68.63, Median = 68, Range = 59