Keystones — Capstone
Five GCSE retrieval questions · 11 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √304
Answer: 4√19 -
2. Algebra Completing the square
Complete the square: x² - 5x - 3
Answer: (x - 5⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 15cm, angle = 65°. Give your answer to 2 decimal places
Answer: 190.32cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 21:12:4 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 42, 60, 50, 99, 81, 23. Give your answer to 2 decimal places
Answer: Mean = 59.71, Median = 60, Range = 76