Keystones — Capstone
Five GCSE retrieval questions · 12 April 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√28
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: 3x² + 6x + 6
Answer: 3(x + 1)² + 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 23cm, angle = 74°. Give your answer to 2 decimal places
Answer: 198.98cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 24:40:35 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 28, 80, 11, 39, 19, 25, 99
Answer: Mean = 39, Median = 26.5, Range = 88