Keystones — Capstone
Five GCSE retrieval questions · 25 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: 2x² + 4x - 4
Answer: 2(x + 1)² - 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 17cm, angle = 59°. Give your answer to 2 decimal places
Answer: 196.72cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 24:42:7 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 88, 32, 97, 35, 48, 85. Give your answer to 2 decimal places
Answer: Mean = 66.14, Median = 78, Range = 65