Keystones — Capstone
Five GCSE retrieval questions · 5 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: 4x² + 8x - 2
Answer: 4(x + 1)² - 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 22cm, angle = 55°. Give your answer to 2 decimal places
Answer: 207.25cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 81:36:28 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 75, 93, 18, 23, 53, 46, 52, 48. Give your answer to 2 decimal places
Answer: Mean = 54.56, Median = 52, Range = 75