Keystones — Capstone
Five GCSE retrieval questions · 8 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√96
Answer: 16√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 = 15cm, b = 15cm, angle = 62°. Give your answer to 2 decimal places
Answer: 99.33cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 40:35:21 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 88, 64, 62, 27, 56, 35. Give your answer to 2 decimal places
Answer: Mean = 60.29, Median = 62, Range = 63