Keystones — Capstone
Five GCSE retrieval questions · 28 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: x² + 5x + 4
Answer: (x + 5⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 16cm, angle = 74°. Give your answer to 2 decimal places
Answer: 215.32cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 24:28:7 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 90, 56, 33, 84, 47, 71, 76, 46. Give your answer to 2 decimal places
Answer: Mean = 64.33, Median = 71, Range = 57