Keystones — Capstone
Five GCSE retrieval questions · 8 May 2013 · 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 - 18x + 10
Answer: 3(x - 3)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 19cm, angle = 80°. Give your answer to 2 decimal places
Answer: 112.27cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 48:56:21 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 93, 51, 16, 49, 89, 86, 38. Give your answer to 2 decimal places
Answer: Mean = 58.88, Median = 50, Range = 77