Keystones — Capstone
Five GCSE retrieval questions · 2 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√112
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² - 9x + 12
Answer: (x - 9⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 12cm, angle = 43°. Give your answer to 2 decimal places
Answer: 102.3cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 10:14:49 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 19, 14, 21, 53, 45, 74. Give your answer to 2 decimal places
Answer: Mean = 35.71, Median = 24, Range = 60