Keystones — Capstone
Five GCSE retrieval questions · 14 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√75
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: x² - 7x + 6
Answer: (x - 7⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 18cm, angle = 77°. Give your answer to 2 decimal places
Answer: 219.23cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 21:18:16 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 28, 29, 83, 95, 54, 83, 13, 64. Give your answer to 2 decimal places
Answer: Mean = 53.56, Median = 54, Range = 82