Keystones — Capstone
Five GCSE retrieval questions · 1 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √343
Answer: 7√7 -
2. Algebra Completing the square
Complete the square: 3x² + 24x + 12
Answer: 3(x + 4)² - 36 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 28cm, angle = 64°. Give your answer to 2 decimal places
Answer: 314.58cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 18:21:49 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 44, 63, 33, 88, 81, 68, 25, 24
Answer: Mean = 56, Median = 63, Range = 64