Keystones — Capstone
Five GCSE retrieval questions · 1 April 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: 5x² + 40x - 3
Answer: 5(x + 4)² - 83 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 17cm, angle = 69°. Give your answer to 2 decimal places
Answer: 103.16cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 56:21:24 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 70, 61, 62, 49, 16, 78, 92. Give your answer to 2 decimal places
Answer: Mean = 56.63, Median = 61.5, Range = 76