Keystones — Capstone
Five GCSE retrieval questions · 19 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√150
Answer: 15√6 -
2. Algebra Completing the square
Complete the square: x² - 9x - 3
Answer: (x - 9⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 30cm, angle = 70°. Give your answer to 2 decimal places
Answer: 253.72cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 64:40:15 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 35, 20, 98, 61, 80, 85. Give your answer to 2 decimal places
Answer: Mean = 64.43, Median = 72, Range = 78