Keystones — Capstone
Five GCSE retrieval questions · 13 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: 3x² - 36x + 14
Answer: 3(x - 6)² - 94 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 22cm, angle = 40°. Give your answer to 2 decimal places
Answer: 127.27cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 36:63:56 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 58, 66, 94, 66, 81, 70, 46, 29
Answer: Mean = 58, Median = 66, Range = 82