Keystones — Capstone
Five GCSE retrieval questions · 20 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: x² - x + 1
Answer: (x - 1⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 28cm, angle = 53°. Give your answer to 2 decimal places
Answer: 190.08cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 48:40:45 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 98, 63, 24, 75, 30, 56, 36. Give your answer to 2 decimal places
Answer: Mean = 59.38, Median = 59.5, Range = 74