Keystones — Capstone
Five GCSE retrieval questions · 9 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: x² - 5x - 6
Answer: (x - 5⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 17cm, angle = 72°. Give your answer to 2 decimal places
Answer: 194.02cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 28:35:45 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 19, 60, 61, 84, 59, 34, 13, 70. Give your answer to 2 decimal places
Answer: Mean = 49.11, Median = 59, Range = 71