Keystones — Capstone
Five GCSE retrieval questions · 15 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√12
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² - 11x + 12
Answer: (x - 11⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 24cm, angle = 67°. Give your answer to 2 decimal places
Answer: 331.38cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 8:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 10, 32, 26, 99, 91, 27. Give your answer to 2 decimal places
Answer: Mean = 49.29, Median = 32, Range = 89