Keystones — Capstone
Five GCSE retrieval questions · 3 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√12
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: x² + 11x + 9
Answer: (x + 11⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 27cm, angle = 73°. Give your answer to 2 decimal places
Answer: 193.65cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 63:56:48 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 73, 55, 74, 52, 42, 21
Answer: Mean = 48, Median = 52, Range = 55