Keystones — Capstone
Five GCSE retrieval questions · 24 March 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√80
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - 9x - 1
Answer: (x - 9⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 24cm, angle = 62°. Give your answer to 2 decimal places
Answer: 127.14cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 14:63:45 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 74, 89, 89, 82, 72, 58. Give your answer to 2 decimal places
Answer: Mean = 70.71, Median = 74, Range = 58