Keystones — Capstone
Five GCSE retrieval questions · 7 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: x² - 5x + 8
Answer: (x - 5⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 23cm, angle = 49°. Give your answer to 2 decimal places
Answer: 164.9cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 32:72:9 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 19, 21, 64, 43, 77, 22. Give your answer to 2 decimal places
Answer: Mean = 44.29, Median = 43, Range = 58