Keystones — Capstone
Five GCSE retrieval questions · 26 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√54
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: 3x² + 24x - 11
Answer: 3(x + 4)² - 59 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 24cm, angle = 78°. Give your answer to 2 decimal places
Answer: 281.71cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 10:15:6 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 65, 28, 51, 14, 30, 64, 13. Give your answer to 2 decimal places
Answer: Mean = 39.63, Median = 40.5, Range = 52