Keystones — Capstone
Five GCSE retrieval questions · 3 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: x² - x - 1
Answer: (x - 1⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 13cm, angle = 55°. Give your answer to 2 decimal places
Answer: 111.81cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 36:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 27, 98, 98, 99, 86, 88, 24, 14. Give your answer to 2 decimal places
Answer: Mean = 68.67, Median = 86, Range = 85