Keystones — Capstone
Five GCSE retrieval questions · 12 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: 3x² - 12x - 2
Answer: 3(x - 2)² - 14 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 27cm, angle = 51°. Give your answer to 2 decimal places
Answer: 146.88cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 45:40:48 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 72, 11, 74, 63, 58, 44, 27, 72. Give your answer to 2 decimal places
Answer: Mean = 49.78, Median = 58, Range = 63