Keystones — Capstone
Five GCSE retrieval questions · 18 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √525
Answer: 5√21 -
2. Algebra Completing the square
Complete the square: 3x² + 24x + 5
Answer: 3(x + 4)² - 43 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 30cm, angle = 56°. Give your answer to 2 decimal places
Answer: 198.97cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 35:42:6 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 60, 95, 33, 11, 36, 91, 13. Give your answer to 2 decimal places
Answer: Mean = 47.13, Median = 37, Range = 84