Keystones — Capstone
Five GCSE retrieval questions · 15 June 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √637
Answer: 7√13 -
2. Algebra Completing the square
Complete the square: 5x² - 50x + 5
Answer: 5(x - 5)² - 120 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 12cm, angle = 44°. Give your answer to 2 decimal places
Answer: 58.35cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 16:56:63 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 78, 25, 100, 87, 90, 79, 25
Answer: Mean = 62.25, Median = 78.5, Range = 86