Keystones — Capstone
Five GCSE retrieval questions · 14 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√50
Answer: 15√2 -
2. Algebra Completing the square
Complete the square: x² + 7x - 10
Answer: (x + 7⁄2)² - 89⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 25cm, angle = 48°. Give your answer to 2 decimal places
Answer: 269.39cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 24:20:25 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 64, 99, 21, 99, 84, 33, 48
Answer: Mean = 67, Median = 74, Range = 78