Keystones — Capstone
Five GCSE retrieval questions · 29 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √294
Answer: 7√6 -
2. Algebra Completing the square
Complete the square: x² - 7x + 7
Answer: (x - 7⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 14cm, angle = 40°. Give your answer to 2 decimal places
Answer: 67.49cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 14:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 58, 73, 91, 23, 71, 48, 88, 67. Give your answer to 2 decimal places
Answer: Mean = 68.44, Median = 71, Range = 74