Keystones — Capstone
Five GCSE retrieval questions · 16 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: x² - 5x + 5
Answer: (x - 5⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 15cm, angle = 76°. Give your answer to 2 decimal places
Answer: 152.82cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 9:72:56 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 25, 16, 99, 36, 83, 16. Give your answer to 2 decimal places
Answer: Mean = 49.29, Median = 36, Range = 83