Keystones — Capstone
Five GCSE retrieval questions · 12 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 11x - 11
Answer: (x + 11⁄2)² - 165⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 19cm, angle = 80°. Give your answer to 2 decimal places
Answer: 224.54cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 56:40:35 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 66, 93, 36, 15, 88, 51, 100, 75. Give your answer to 2 decimal places
Answer: Mean = 67.11, Median = 75, Range = 85