Keystones — Capstone
Five GCSE retrieval questions · 25 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: 5x² - 50x - 7
Answer: 5(x - 5)² - 132 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 17cm, angle = 54°. Give your answer to 2 decimal places
Answer: 178.79cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 4:36:9 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 82, 14, 63, 35, 88, 16, 51. Give your answer to 2 decimal places
Answer: Mean = 48.13, Median = 43.5, Range = 74