Keystones — Capstone
Five GCSE retrieval questions · 4 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √375
Answer: 5√15 -
2. Algebra Completing the square
Complete the square: x² + 5x + 1
Answer: (x + 5⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 23cm, angle = 47°. Give your answer to 2 decimal places
Answer: 117.75cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 6:15:10 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 50, 40, 85, 17, 54, 26. Give your answer to 2 decimal places
Answer: Mean = 46.57, Median = 50, Range = 68