Keystones — Capstone
Five GCSE retrieval questions · 16 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √833
Answer: 7√17 -
2. Algebra Completing the square
Complete the square: x² + 3x + 11
Answer: (x + 3⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 19cm, angle = 77°. Give your answer to 2 decimal places
Answer: 120.33cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 40:15:9 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 84, 13, 92, 80, 43, 83
Answer: Mean = 64, Median = 80, Range = 79