Keystones — Capstone
Five GCSE retrieval questions · 22 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: x² + 5x + 9
Answer: (x + 5⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 22cm, angle = 55°. Give your answer to 2 decimal places
Answer: 108.13cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 16:36:27 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 22, 67, 74, 62, 65, 94, 75
Answer: Mean = 60, Median = 66, Range = 73