Keystones — Capstone
Five GCSE retrieval questions · 9 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √245
Answer: 7√5 -
2. Algebra Completing the square
Complete the square: 2x² + 8x - 4
Answer: 2(x + 2)² - 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 25cm, angle = 80°. Give your answer to 2 decimal places
Answer: 172.34cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 72:40:15 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 69, 72, 27, 56, 90, 93, 28, 44. Give your answer to 2 decimal places
Answer: Mean = 62.78, Median = 69, Range = 66