Keystones — Capstone
Five GCSE retrieval questions · 1 March 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: 3x² - 30x - 1
Answer: 3(x - 5)² - 76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 29cm, angle = 52°. Give your answer to 2 decimal places
Answer: 137.11cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 21:28:36 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 73, 58, 59, 90, 53, 96. Give your answer to 2 decimal places
Answer: Mean = 63.14, Median = 59, Range = 83