Keystones — Capstone
Five GCSE retrieval questions · 27 March 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: x² + 9x + 9
Answer: (x + 9⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 30cm, angle = 76°. Give your answer to 2 decimal places
Answer: 392.97cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 21:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 18, 90, 78, 85, 100, 72. Give your answer to 2 decimal places
Answer: Mean = 72.43, Median = 78, Range = 82