Keystones — Capstone
Five GCSE retrieval questions · 11 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √448
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² + 7x + 11
Answer: (x + 7⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 27cm, angle = 43°. Give your answer to 2 decimal places
Answer: 230.17cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 35:28:12 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 58, 34, 90, 39, 93, 22, 42
Answer: Mean = 54, Median = 48, Range = 71