Keystones — Capstone
Five GCSE retrieval questions · 6 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √325
Answer: 5√13 -
2. Algebra Completing the square
Complete the square: 4x² - 8x - 1
Answer: 4(x - 1)² - 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 15cm, angle = 57°. Give your answer to 2 decimal places
Answer: 94.35cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 64:72:45 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 63, 68, 75, 97, 31, 80, 33
Answer: Mean = 59.5, Median = 65.5, Range = 68