Keystones — Capstone
Five GCSE retrieval questions · 5 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² + 5x - 1
Answer: (x + 5⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 23cm, angle = 62°. Give your answer to 2 decimal places
Answer: 243.69cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 16:28:7 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 53, 56, 81, 18, 11, 88, 36
Answer: Mean = 45.25, Median = 44.5, Range = 77