Keystones — Capstone
Five GCSE retrieval questions · 21 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√27
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² + 5x - 3
Answer: (x + 5⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 17cm, angle = 69°. Give your answer to 2 decimal places
Answer: 230.13cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 35:14:2 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 24, 57, 42, 47, 40, 18. Give your answer to 2 decimal places
Answer: Mean = 46.57, Median = 42, Range = 80