Keystones — Capstone
Five GCSE retrieval questions · 1 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √245
Answer: 7√5 -
2. Algebra Completing the square
Complete the square: 4x² - 24x + 1
Answer: 4(x - 3)² - 35 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 14cm, angle = 74°. Give your answer to 2 decimal places
Answer: 168.22cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 10:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 23, 71, 94, 35, 58, 96. Give your answer to 2 decimal places
Answer: Mean = 67.86, Median = 71, Range = 75