Keystones — Capstone
Five GCSE retrieval questions · 2 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: 3x² + 18x - 14
Answer: 3(x + 3)² - 41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 15cm, angle = 65°. Give your answer to 2 decimal places
Answer: 108.76cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 12:28:63 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 90, 94, 59, 95, 56, 61, 96, 84. Give your answer to 2 decimal places
Answer: Mean = 75.89, Median = 84, Range = 48