Keystones — Capstone
Five GCSE retrieval questions · 14 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√44
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: 4x² + 40x + 9
Answer: 4(x + 5)² - 91 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 15cm, angle = 44°. Give your answer to 2 decimal places
Answer: 72.94cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 9:45:40 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 93, 90, 78, 17, 77, 73. Give your answer to 2 decimal places
Answer: Mean = 70.86, Median = 77, Range = 76