Keystones — Capstone
Five GCSE retrieval questions · 6 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √448
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: 5x² + 50x + 2
Answer: 5(x + 5)² - 123 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 29cm, angle = 73°. Give your answer to 2 decimal places
Answer: 166.4cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 12:30:35 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 17, 39, 65, 63, 22, 34. Give your answer to 2 decimal places
Answer: Mean = 36.29, Median = 34, Range = 51