Keystones — Capstone
Five GCSE retrieval questions · 29 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √525
Answer: 5√21 -
2. Algebra Completing the square
Complete the square: x² - 9x + 8
Answer: (x - 9⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 29cm, angle = 74°. Give your answer to 2 decimal places
Answer: 181.2cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 5:30:24 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 11, 70, 71, 13, 40, 61, 84, 63. Give your answer to 2 decimal places
Answer: Mean = 55.56, Median = 63, Range = 76