Keystones — Capstone
Five GCSE retrieval questions · 9 September 2011 · 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 - 5x + 12
Answer: (x - 5⁄2)² + 23⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 14cm, angle = 58°. Give your answer to 2 decimal places
Answer: 172.15cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 18:14:63 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 26, 83, 70, 56, 30, 94, 21, 83. Give your answer to 2 decimal places
Answer: Mean = 54.33, Median = 56, Range = 73