Keystones — Capstone
Five GCSE retrieval questions · 17 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: x² - 9x + 11
Answer: (x - 9⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 27cm, angle = 44°. Give your answer to 2 decimal places
Answer: 262.58cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 72:56:21 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 65, 81, 31, 51, 56, 15, 34, 88. Give your answer to 2 decimal places
Answer: Mean = 54.67, Median = 56, Range = 73