Keystones — Capstone
Five GCSE retrieval questions · 22 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: 5x² - 10x - 8
Answer: 5(x - 1)² - 13 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 29cm, angle = 66°. Give your answer to 2 decimal places
Answer: 211.94cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 8:10:5 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 49, 24, 17, 59, 24, 85. Give your answer to 2 decimal places
Answer: Mean = 43.29, Median = 45, Range = 68