Keystones — Capstone
Five GCSE retrieval questions · 31 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 5x² + 30x - 6
Answer: 5(x + 3)² - 51 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 26cm, angle = 70°. Give your answer to 2 decimal places
Answer: 171.02cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 21:28:8 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 88, 55, 55, 83, 14, 78, 44, 18. Give your answer to 2 decimal places
Answer: Mean = 53.11, Median = 55, Range = 74