Keystones — Capstone
Five GCSE retrieval questions · 30 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √600
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: x² - 9x + 8
Answer: (x - 9⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 22cm, angle = 68°. Give your answer to 2 decimal places
Answer: 173.38cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 42:35:45 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 65, 74, 92, 60, 15, 84
Answer: Mean = 61, Median = 65, Range = 77