Keystones — Capstone
Five GCSE retrieval questions · 15 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 7x - 5
Answer: (x + 7⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 29cm, angle = 70°. Give your answer to 2 decimal places
Answer: 408.77cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 49:56:64 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 17, 94, 10, 63, 78, 28. Give your answer to 2 decimal places
Answer: Mean = 47.57, Median = 43, Range = 84