Keystones — Capstone
Five GCSE retrieval questions · 21 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: x² - x + 9
Answer: (x - 1⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 30cm, angle = 75°. Give your answer to 2 decimal places
Answer: 202.84cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 8:12:3 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 34, 11, 97, 33, 51, 29, 70. Give your answer to 2 decimal places
Answer: Mean = 52.38, Median = 42.5, Range = 86