Keystones — Capstone
Five GCSE retrieval questions · 24 May 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: 2x² - 24x + 4
Answer: 2(x - 6)² - 68 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 24cm, angle = 59°. Give your answer to 2 decimal places
Answer: 174.86cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 4:20:35 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 42, 56, 61, 48, 67, 89. Give your answer to 2 decimal places
Answer: Mean = 63.43, Median = 61, Range = 47