Keystones — Capstone
Five GCSE retrieval questions · 8 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
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 = 29cm, b = 23cm, angle = 74°. Give your answer to 2 decimal places
Answer: 320.58cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 32:12:21 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 78, 26, 31, 89, 41, 41, 58, 56. Give your answer to 2 decimal places
Answer: Mean = 53.33, Median = 56, Range = 63