Keystones — Capstone
Five GCSE retrieval questions · 6 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: 4x² + 24x - 6
Answer: 4(x + 3)² - 42 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 20cm, angle = 53°. Give your answer to 2 decimal places
Answer: 167.71cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 40:45:63 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 83, 31, 20, 48, 11, 32
Answer: Mean = 44, Median = 32, Range = 72