Keystones — Capstone
Five GCSE retrieval questions · 13 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√24
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: x² - 11x - 1
Answer: (x - 11⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 16cm, angle = 77°. Give your answer to 2 decimal places
Answer: 233.85cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 64:56:35 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 39, 93, 56, 25, 38, 95. Give your answer to 2 decimal places
Answer: Mean = 57.29, Median = 55, Range = 70