Keystones — Capstone
Five GCSE retrieval questions · 21 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√24
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: x² + 5x + 4
Answer: (x + 5⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 29cm, angle = 57°. Give your answer to 2 decimal places
Answer: 218.89cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 49:21:18 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 33, 68, 60, 47, 64, 77. Give your answer to 2 decimal places
Answer: Mean = 63.29, Median = 64, Range = 61