Keystones — Capstone
Five GCSE retrieval questions · 11 February 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√275
Answer: 20√11 -
2. Algebra Completing the square
Complete the square: 4x² + 8x + 11
Answer: 4(x + 1)² + 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 22cm, angle = 72°. Give your answer to 2 decimal places
Answer: 136cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 45:63:56 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 61, 61, 20, 36, 75, 41
Answer: Mean = 52, Median = 61, Range = 55