Keystones — Capstone
Five GCSE retrieval questions · 5 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √539
Answer: 7√11 -
2. Algebra Completing the square
Complete the square: x² + x - 4
Answer: (x + 1⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 29cm, angle = 41°. Give your answer to 2 decimal places
Answer: 228.31cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 81:63:14 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 80, 64, 91, 71, 76, 97, 30, 18. Give your answer to 2 decimal places
Answer: Mean = 64.11, Median = 71, Range = 79