Keystones — Capstone
Five GCSE retrieval questions · 8 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √245
Answer: 7√5 -
2. Algebra Completing the square
Complete the square: 4x² - 16x + 12
Answer: 4(x - 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 24cm, angle = 69°. Give your answer to 2 decimal places
Answer: 190.45cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 35:10:14 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 10, 29, 89, 17, 50, 91. Give your answer to 2 decimal places
Answer: Mean = 52.86, Median = 50, Range = 81