Keystones — Capstone
Five GCSE retrieval questions · 16 September 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 + 10x - 2
Answer: 5(x + 1)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 30cm, angle = 76°. Give your answer to 2 decimal places
Answer: 247.43cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 7:42:30 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 100, 17, 60, 49, 71, 33. Give your answer to 2 decimal places
Answer: Mean = 58.86, Median = 60, Range = 83