Keystones — Capstone
Five GCSE retrieval questions · 13 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: 5x² - 50x - 10
Answer: 5(x - 5)² - 135 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 18cm, angle = 68°. Give your answer to 2 decimal places
Answer: 241.99cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 35:20:16 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 77, 77, 46, 99, 66, 28. Give your answer to 2 decimal places
Answer: Mean = 58.86, Median = 66, Range = 80