Keystones — Capstone
Five GCSE retrieval questions · 30 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√250
Answer: 15√10 -
2. Algebra Completing the square
Complete the square: 2x² - 16x + 4
Answer: 2(x - 4)² - 28 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 21cm, angle = 43°. Give your answer to 2 decimal places
Answer: 193.35cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 9:15:20 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 99, 55, 81, 80, 31, 63, 38. Give your answer to 2 decimal places
Answer: Mean = 67.13, Median = 71.5, Range = 68