Keystones — Capstone
Five GCSE retrieval questions · 10 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√28
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: x² - 3x - 12
Answer: (x - 3⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 21cm, angle = 48°. Give your answer to 2 decimal places
Answer: 195.08cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 72:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 83, 56, 58, 99, 90, 62. Give your answer to 2 decimal places
Answer: Mean = 70.71, Median = 62, Range = 52