Keystones — Capstone
Five GCSE retrieval questions · 8 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √896
Answer: 8√14 -
2. Algebra Completing the square
Complete the square: 2x² - 24x - 10
Answer: 2(x - 6)² - 82 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 15cm, angle = 46°. Give your answer to 2 decimal places
Answer: 80.93cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 49:63:45 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 29, 37, 80, 74, 36, 83, 90, 17. Give your answer to 2 decimal places
Answer: Mean = 54.78, Median = 47, Range = 73