Keystones — Capstone
Five GCSE retrieval questions · 16 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √80
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: 4x² - 40x + 5
Answer: 4(x - 5)² - 95 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 28cm, angle = 42°. Give your answer to 2 decimal places
Answer: 224.83cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 49:28:16 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 36, 66, 96, 52, 11, 76
Answer: Mean = 62, Median = 66, Range = 86