Keystones — Capstone
Five GCSE retrieval questions · 25 April 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² + 3x + 6
Answer: (x + 3⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 29cm, angle = 61°. Give your answer to 2 decimal places
Answer: 177.55cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 81:18:8 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 24, 22, 16, 85, 20, 54, 61. Give your answer to 2 decimal places
Answer: Mean = 42.88, Median = 39, Range = 69