Keystones — Capstone
Five GCSE retrieval questions · 24 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√150
Answer: 20√6 -
2. Algebra Completing the square
Complete the square: x² + 9x + 9
Answer: (x + 9⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 18cm, angle = 61°. Give your answer to 2 decimal places
Answer: 94.46cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 28:63:54 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 48, 76, 63, 69, 60, 36, 17
Answer: Mean = 50.75, Median = 54, Range = 59