Keystones — Capstone
Five GCSE retrieval questions · 29 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: x² - 7x + 3
Answer: (x - 7⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 28cm, angle = 41°. Give your answer to 2 decimal places
Answer: 119.4cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 14:18:3 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 33, 71, 83, 54, 85, 50, 52. Give your answer to 2 decimal places
Answer: Mean = 62.38, Median = 62.5, Range = 52