Keystones — Capstone
Five GCSE retrieval questions · 26 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √176
Answer: 4√11 -
2. Algebra Completing the square
Complete the square: x² - 5x + 5
Answer: (x - 5⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 25cm, angle = 76°. Give your answer to 2 decimal places
Answer: 291.09cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 18:14:63 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 33, 64, 29, 19, 49, 93, 94, 95
Answer: Mean = 57, Median = 49, Range = 76