Keystones — Capstone
Five GCSE retrieval questions · 4 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√112
Answer: 12√7 -
2. Algebra Completing the square
Complete the square: 2x² + 16x - 2
Answer: 2(x + 4)² - 34 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 22cm, angle = 68°. Give your answer to 2 decimal places
Answer: 234.58cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 24:40:15 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 25, 87, 71, 75, 67, 26, 36, 37. Give your answer to 2 decimal places
Answer: Mean = 48.44, Median = 37, Range = 75