Keystones — Capstone
Five GCSE retrieval questions · 8 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√63
Answer: 12√7 -
2. Algebra Completing the square
Complete the square: 4x² - 24x - 12
Answer: 4(x - 3)² - 48 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 21cm, angle = 47°. Give your answer to 2 decimal places
Answer: 161.26cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 25:10:8 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 50, 11, 25, 30, 74, 85, 50, 53
Answer: Mean = 48, Median = 50, Range = 74