Keystones — Capstone
Five GCSE retrieval questions · 9 June 2016 · 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 - 6
Answer: (x - 5⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 16cm, angle = 55°. Give your answer to 2 decimal places
Answer: 131.06cm² -
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: 21, 29, 41, 73, 11, 82, 82. Give your answer to 2 decimal places
Answer: Mean = 48.43, Median = 41, Range = 71