Keystones — Capstone
Five GCSE retrieval questions · 13 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: 3x² + 24x + 7
Answer: 3(x + 4)² - 41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 25cm, angle = 76°. Give your answer to 2 decimal places
Answer: 266.83cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 24:42:35 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 64, 60, 36, 96, 73, 39. Give your answer to 2 decimal places
Answer: Mean = 60.86, Median = 60, Range = 60