Keystones — Capstone
Five GCSE retrieval questions · 15 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√96
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: 4x² - 24x
Answer: 4(x - 3)² - 36 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 16cm, angle = 71°. Give your answer to 2 decimal places
Answer: 204.23cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 12:21:35 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 24, 73, 28, 43, 51, 57, 67, 91. Give your answer to 2 decimal places
Answer: Mean = 58.89, Median = 57, Range = 72