Keystones — Capstone
Five GCSE retrieval questions · 22 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√75
Answer: 25√3 -
2. Algebra Completing the square
Complete the square: x² + 9x - 8
Answer: (x + 9⁄2)² - 113⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 17cm, angle = 80°. Give your answer to 2 decimal places
Answer: 150.68cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 7:35:45 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 93, 39, 84, 93, 56, 99
Answer: Mean = 77, Median = 84, Range = 60