Keystones — Capstone
Five GCSE retrieval questions · 24 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √176
Answer: 4√11 -
2. Algebra Completing the square
Complete the square: x² + 9x - 12
Answer: (x + 9⁄2)² - 129⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 27cm, angle = 41°. Give your answer to 2 decimal places
Answer: 265.7cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 35:10:2 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 98, 98, 12, 57, 11, 59. Give your answer to 2 decimal places
Answer: Mean = 54.57, Median = 57, Range = 87