Keystones — Capstone
Five GCSE retrieval questions · 11 March 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√160
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² + x + 9
Answer: (x + 1⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 22cm, angle = 58°. Give your answer to 2 decimal places
Answer: 177.24cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 81:18:10 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 54, 65, 68, 92, 29, 46, 77, 79. Give your answer to 2 decimal places
Answer: Mean = 62.56, Median = 65, Range = 63