Keystones — Capstone
Five GCSE retrieval questions · 18 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√8
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 3x² + 18x - 6
Answer: 3(x + 3)² - 33 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 28cm, angle = 43°. Give your answer to 2 decimal places
Answer: 162.32cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 25:20:24 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 32, 45, 53, 47, 38, 25, 68, 75. Give your answer to 2 decimal places
Answer: Mean = 46.56, Median = 45, Range = 50