Keystones — Capstone
Five GCSE retrieval questions · 18 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: 2x² - 4x - 3
Answer: 2(x - 1)² - 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 25cm, angle = 61°. Give your answer to 2 decimal places
Answer: 273.32cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 49:35:40 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 42, 73, 89, 20, 17, 93, 46. Give your answer to 2 decimal places
Answer: Mean = 59.13, Median = 59.5, Range = 76