Keystones — Capstone
Five GCSE retrieval questions · 26 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√90
Answer: 15√10 -
2. Algebra Completing the square
Complete the square: x² - 11x + 5
Answer: (x - 11⁄2)² - 101⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 17cm, angle = 73°. Give your answer to 2 decimal places
Answer: 154.44cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 49:56:48 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 49, 51, 96, 86, 26, 40. Give your answer to 2 decimal places
Answer: Mean = 63.57, Median = 51, Range = 71