Keystones — Capstone
Five GCSE retrieval questions · 30 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: x² + 5x + 2
Answer: (x + 5⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 26cm, angle = 57°. Give your answer to 2 decimal places
Answer: 294.37cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 24:42:7 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 31, 95, 55, 41, 87, 20, 10. Give your answer to 2 decimal places
Answer: Mean = 48.88, Median = 46.5, Range = 85