Keystones — Capstone
Five GCSE retrieval questions · 8 December 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 + 24x + 7
Answer: 3(x + 4)² - 41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 13cm, angle = 64°. Give your answer to 2 decimal places
Answer: 175.26cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 10:35:14 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 81, 67, 88, 88, 42, 19, 46
Answer: Mean = 62.5, Median = 68, Range = 69