Keystones — Capstone
Five GCSE retrieval questions · 24 February 2011 · 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 - x + 9
Answer: (x - 1⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 19cm, angle = 68°. Give your answer to 2 decimal places
Answer: 114.51cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 64:40:15 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 66, 30, 89, 87, 50, 54, 62. Give your answer to 2 decimal places
Answer: Mean = 66.38, Median = 64, Range = 63