Keystones — Capstone
Five GCSE retrieval questions · 12 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√125
Answer: 25√5 -
2. Algebra Completing the square
Complete the square: 4x² - 48x - 15
Answer: 4(x - 6)² - 159 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 15cm, angle = 76°. Give your answer to 2 decimal places
Answer: 174.65cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 81:72:40 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 11, 64, 15, 66, 37, 25. Give your answer to 2 decimal places
Answer: Mean = 40.29, Median = 37, Range = 55