Keystones — Capstone
Five GCSE retrieval questions · 9 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: 2x² + 16x + 2
Answer: 2(x + 4)² - 30 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 30cm, angle = 71°. Give your answer to 2 decimal places
Answer: 382.94cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 27:12:16 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 11, 45, 93, 60, 65, 65, 51, 84. Give your answer to 2 decimal places
Answer: Mean = 58.56, Median = 60, Range = 82