Keystones — Capstone
Five GCSE retrieval questions · 5 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: x² + 3x + 3
Answer: (x + 3⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 15cm, angle = 80°. Give your answer to 2 decimal places
Answer: 169.88cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 35:15:18 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 86, 96, 38, 42, 72, 63, 19, 64. Give your answer to 2 decimal places
Answer: Mean = 61.56, Median = 64, Range = 77