Keystones — Capstone
Five GCSE retrieval questions · 14 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: 3x² - 12x + 14
Answer: 3(x - 2)² + 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 23cm, angle = 51°. Give your answer to 2 decimal places
Answer: 205.56cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 21:12:32 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 38, 70, 75, 42, 42, 64, 25, 78. Give your answer to 2 decimal places
Answer: Mean = 53.11, Median = 44, Range = 53