Keystones — Capstone
Five GCSE retrieval questions · 6 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: x² + 11x + 11
Answer: (x + 11⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 20cm, angle = 52°. Give your answer to 2 decimal places
Answer: 157.6cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 2:12:21 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 56, 26, 88, 86, 79, 44, 30, 33. Give your answer to 2 decimal places
Answer: Mean = 51.78, Median = 44, Range = 64