Keystones — Capstone
Five GCSE retrieval questions · 15 February 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: 3x² + 36x - 9
Answer: 3(x + 6)² - 117 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 30cm, angle = 59°. Give your answer to 2 decimal places
Answer: 218.58cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 5:10:16 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 17, 93, 35, 34, 52, 13. Give your answer to 2 decimal places
Answer: Mean = 47.29, Median = 35, Range = 80