Keystones — Capstone
Five GCSE retrieval questions · 10 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 3x² + 12x + 2
Answer: 3(x + 2)² - 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 13cm, angle = 72°. Give your answer to 2 decimal places
Answer: 179.27cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 28:63:45 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 50, 65, 48, 56, 86, 26, 93, 28. Give your answer to 2 decimal places
Answer: Mean = 58.67, Median = 56, Range = 67