Keystones — Capstone
Five GCSE retrieval questions · 20 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: x² - 9x + 10
Answer: (x - 9⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 30cm, angle = 79°. Give your answer to 2 decimal places
Answer: 191.42cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 49:14:8 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 23, 58, 14, 81, 70, 77. Give your answer to 2 decimal places
Answer: Mean = 59.86, Median = 70, Range = 82