Keystones — Capstone
Five GCSE retrieval questions · 14 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√80
Answer: 16√5 -
2. Algebra Completing the square
Complete the square: x² + 7x + 8
Answer: (x + 7⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 19cm, angle = 75°. Give your answer to 2 decimal places
Answer: 156cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 5:20:24 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 51, 63, 26, 28, 50, 17, 68
Answer: Mean = 40.5, Median = 39, Range = 51