Keystones — Capstone
Five GCSE retrieval questions · 14 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: x² - 5x - 8
Answer: (x - 5⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 29cm, angle = 55°. Give your answer to 2 decimal places
Answer: 296.94cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 18:10:25 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 38, 35, 34, 53, 66, 85, 89, 73. Give your answer to 2 decimal places
Answer: Mean = 54.56, Median = 53, Range = 71