Keystones — Capstone
Five GCSE retrieval questions · 13 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√112
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² + 5x + 1
Answer: (x + 5⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 13cm, angle = 79°. Give your answer to 2 decimal places
Answer: 165.89cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 27:63:56 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 53, 12, 71, 53, 33, 33, 60, 72. Give your answer to 2 decimal places
Answer: Mean = 45.67, Median = 53, Range = 60