Keystones — Capstone
Five GCSE retrieval questions · 11 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√150
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: x² - x + 9
Answer: (x - 1⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 29cm, angle = 62°. Give your answer to 2 decimal places
Answer: 179.24cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 36:63:28 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 84, 77, 14, 53, 15, 84, 81, 39. Give your answer to 2 decimal places
Answer: Mean = 57.56, Median = 71, Range = 70