Keystones — Capstone
Five GCSE retrieval questions · 26 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: x² + 5x + 9
Answer: (x + 5⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 14cm, angle = 40°. Give your answer to 2 decimal places
Answer: 107.99cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 3:12:32 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 72, 22, 37, 36, 89, 94, 54, 66. Give your answer to 2 decimal places
Answer: Mean = 54.44, Median = 54, Range = 74