Keystones — Capstone
Five GCSE retrieval questions · 16 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√50
Answer: 25√2 -
2. Algebra Completing the square
Complete the square: x² + 9x + 1
Answer: (x + 9⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 28cm, angle = 71°. Give your answer to 2 decimal places
Answer: 317.69cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 8:10:15 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 84, 82, 44, 95, 99, 93, 94, 57. Give your answer to 2 decimal places
Answer: Mean = 79.67, Median = 84, Range = 55