Keystones — Capstone
Five GCSE retrieval questions · 19 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² - 7x + 6
Answer: (x - 7⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 24cm, angle = 72°. Give your answer to 2 decimal places
Answer: 342.38cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 35:15:12 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 80, 38, 89, 99, 18, 30, 65, 27. Give your answer to 2 decimal places
Answer: Mean = 51.89, Median = 38, Range = 81