Keystones — Capstone
Five GCSE retrieval questions · 25 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 5x² + 10x + 3
Answer: 5(x + 1)² - 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 16cm, angle = 69°. Give your answer to 2 decimal places
Answer: 119.5cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 8:20:5 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 42, 40, 95, 87, 39, 48, 70. Give your answer to 2 decimal places
Answer: Mean = 62.63, Median = 59, Range = 56