Keystones — Capstone
Five GCSE retrieval questions · 2 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√75
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 4x² + 48x
Answer: 4(x + 6)² - 144 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 19cm, angle = 69°. Give your answer to 2 decimal places
Answer: 266.07cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 48:40:15 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 53, 38, 87, 39, 43, 82. Give your answer to 2 decimal places
Answer: Mean = 51.57, Median = 43, Range = 68