Keystones — Capstone
Five GCSE retrieval questions · 20 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√54
Answer: 15√6 -
2. Algebra Completing the square
Complete the square: x² - 11x - 8
Answer: (x - 11⁄2)² - 153⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 19cm, angle = 58°. Give your answer to 2 decimal places
Answer: 96.68cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 30:35:28 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 95, 49, 60, 69, 14, 43, 58. Give your answer to 2 decimal places
Answer: Mean = 60.63, Median = 59, Range = 83