Keystones — Capstone
Five GCSE retrieval questions · 31 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
2. Algebra Completing the square
Complete the square: x² - 11x + 4
Answer: (x - 11⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 16cm, angle = 50°. Give your answer to 2 decimal places
Answer: 147.08cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 81:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 11, 23, 70, 83, 17, 77. Give your answer to 2 decimal places
Answer: Mean = 43.71, Median = 25, Range = 72