Keystones — Capstone
Five GCSE retrieval questions · 30 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 5x² + 40x + 1
Answer: 5(x + 4)² - 79 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 22cm, angle = 77°. Give your answer to 2 decimal places
Answer: 289.39cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 15:24:28 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 92, 30, 69, 99, 100, 53, 90
Answer: Mean = 69.25, Median = 79.5, Range = 79