Keystones — Capstone
Five GCSE retrieval questions · 21 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√44
Answer: 8√11 -
2. Algebra Completing the square
Complete the square: x² + 3x - 11
Answer: (x + 3⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 30cm, angle = 77°. Give your answer to 2 decimal places
Answer: 204.62cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 21:12:8 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 41, 38, 90, 45, 41, 74, 70
Answer: Mean = 57.5, Median = 53, Range = 52