Keystones — Capstone
Five GCSE retrieval questions · 21 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√160
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² - 9x - 5
Answer: (x - 9⁄2)² - 101⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 13cm, angle = 76°. Give your answer to 2 decimal places
Answer: 126.14cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 54:63:49 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 65, 23, 53, 63, 56, 95. Give your answer to 2 decimal places
Answer: Mean = 60.71, Median = 63, Range = 72