Keystones — Capstone
Five GCSE retrieval questions · 22 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: x² + 7x - 11
Answer: (x + 7⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 12cm, angle = 55°. Give your answer to 2 decimal places
Answer: 137.62cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 9:72:40 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 97, 60, 37, 68, 15, 47. Give your answer to 2 decimal places
Answer: Mean = 52.43, Median = 47, Range = 82