Keystones — Capstone
Five GCSE retrieval questions · 30 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√45
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: x² + x - 8
Answer: (x + 1⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 25cm, angle = 80°. Give your answer to 2 decimal places
Answer: 196.96cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 9:12:8 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 45, 29, 84, 54, 15, 76, 94
Answer: Mean = 56, Median = 52.5, Range = 79