Keystones — Capstone
Five GCSE retrieval questions · 1 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: x² + 7x - 1
Answer: (x + 7⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 25cm, angle = 48°. Give your answer to 2 decimal places
Answer: 185.79cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 45:20:24 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 65, 94, 59, 54, 57, 48, 51, 27. Give your answer to 2 decimal places
Answer: Mean = 53.44, Median = 54, Range = 68