Keystones — Capstone
Five GCSE retrieval questions · 1 March 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 5x² + 10x - 14
Answer: 5(x + 1)² - 19 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 27cm, angle = 62°. Give your answer to 2 decimal places
Answer: 154.96cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 9:72:16 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 33, 23, 81, 76, 85, 89, 41, 21. Give your answer to 2 decimal places
Answer: Mean = 54.11, Median = 41, Range = 68