Keystones — Capstone
Five GCSE retrieval questions · 7 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √704
Answer: 8√11 -
2. Algebra Completing the square
Complete the square: 2x² - 12x + 13
Answer: 2(x - 3)² - 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 20cm, angle = 58°. Give your answer to 2 decimal places
Answer: 195.05cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 21:56:48 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 24, 29, 97, 77, 43, 89, 48, 28. Give your answer to 2 decimal places
Answer: Mean = 50.33, Median = 43, Range = 79