Keystones — Capstone
Five GCSE retrieval questions · 6 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √684
Answer: 6√19 -
2. Algebra Completing the square
Complete the square: x² + x - 9
Answer: (x + 1⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 21cm, angle = 42°. Give your answer to 2 decimal places
Answer: 203.75cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 20:15:18 -
5. Statistics Averages and range
Find the mean, median and range of: 66, 69, 54, 17, 56, 56, 82. Give your answer to 2 decimal places
Answer: Mean = 57.14, Median = 56, Range = 65