Keystones — Capstone
Five GCSE retrieval questions · 6 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√63
Answer: 15√7 -
2. Algebra Completing the square
Complete the square: 4x² + 40x + 11
Answer: 4(x + 5)² - 89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 23cm, angle = 47°. Give your answer to 2 decimal places
Answer: 176.62cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 21:6:8 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 97, 94, 76, 62, 99, 66, 99. Give your answer to 2 decimal places
Answer: Mean = 85.38, Median = 92, Range = 37