Keystones — Capstone
Five GCSE retrieval questions · 16 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: 5x² - 20x - 13
Answer: 5(x - 2)² - 33 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 18cm, angle = 71°. Give your answer to 2 decimal places
Answer: 153.17cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 2:18:63 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 35, 64, 26, 33, 34, 74, 71. Give your answer to 2 decimal places
Answer: Mean = 52.88, Median = 49.5, Range = 60