Keystones — Capstone
Five GCSE retrieval questions · 30 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: 3x² + 24x - 9
Answer: 3(x + 4)² - 57 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 17cm, angle = 63°. Give your answer to 2 decimal places
Answer: 212.06cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 63:72:8 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 28, 61, 53, 16, 49, 42, 49, 44. Give your answer to 2 decimal places
Answer: Mean = 46.33, Median = 49, Range = 59