Keystones — Capstone
Five GCSE retrieval questions · 1 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √605
Answer: 11√5 -
2. Algebra Completing the square
Complete the square: x² + 9x + 9
Answer: (x + 9⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 26cm, angle = 64°. Give your answer to 2 decimal places
Answer: 292.11cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 8:18:63 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 54, 59, 100, 50, 73, 69, 94, 36. Give your answer to 2 decimal places
Answer: Mean = 65.44, Median = 59, Range = 64