Keystones — Capstone
Five GCSE retrieval questions · 25 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√175
Answer: 25√7 -
2. Algebra Completing the square
Complete the square: 4x² - 40x + 10
Answer: 4(x - 5)² - 90 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 17cm, angle = 63°. Give your answer to 2 decimal places
Answer: 136.32cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 20:15:21 -
5. Statistics Averages and range
Find the mean, median and range of: 66, 42, 10, 49, 55, 93, 43, 13. Give your answer to 2 decimal places
Answer: Mean = 46.38, Median = 46, Range = 83