Keystones — Capstone
Five GCSE retrieval questions · 28 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: 4x² + 40x + 12
Answer: 4(x + 5)² - 88 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 29cm, angle = 68°. Give your answer to 2 decimal places
Answer: 188.22cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 21:18:14 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 50, 80, 38, 94, 23, 92, 95
Answer: Mean = 63, Median = 65, Range = 72