Keystones — Capstone
Five GCSE retrieval questions · 30 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: x² + 7x - 7
Answer: (x + 7⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 22cm, angle = 64°. Give your answer to 2 decimal places
Answer: 118.64cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 28:21:24 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 63, 35, 92, 60, 59, 30. Give your answer to 2 decimal places
Answer: Mean = 51.57, Median = 59, Range = 70