Keystones — Capstone
Five GCSE retrieval questions · 22 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: 5x² + 40x + 3
Answer: 5(x + 4)² - 77 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 17cm, angle = 59°. Give your answer to 2 decimal places
Answer: 211.29cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 15:6:4 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 52, 89, 42, 58, 33, 58, 51, 59. Give your answer to 2 decimal places
Answer: Mean = 55.44, Median = 57, Range = 56