Keystones — Capstone
Five GCSE retrieval questions · 15 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√160
Answer: 20√10 -
2. Algebra Completing the square
Complete the square: 5x² - 60x + 6
Answer: 5(x - 6)² - 174 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 16cm, angle = 75°. Give your answer to 2 decimal places
Answer: 216.37cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 15:24:4 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 43, 99, 73, 78, 32, 30, 34, 25. Give your answer to 2 decimal places
Answer: Mean = 48.33, Median = 34, Range = 78