Keystones — Capstone
Five GCSE retrieval questions · 21 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: 3x² - 6x - 12
Answer: 3(x - 1)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 12cm, angle = 80°. Give your answer to 2 decimal places
Answer: 141.81cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 15:21:49 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 48, 15, 52, 56, 91, 40. Give your answer to 2 decimal places
Answer: Mean = 54.71, Median = 52, Range = 76