Keystones — Capstone
Five GCSE retrieval questions · 12 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: 5x² + 40x
Answer: 5(x + 4)² - 80 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 27cm, angle = 67°. Give your answer to 2 decimal places
Answer: 372.8cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 4:6:21 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 44, 35, 97, 38, 45, 71, 73
Answer: Mean = 52.75, Median = 44.5, Range = 78