Keystones — Capstone
Five GCSE retrieval questions · 27 June 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√275
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: 5x² + 40x + 5
Answer: 5(x + 4)² - 75 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 20cm, angle = 71°. Give your answer to 2 decimal places
Answer: 189.cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 35:40:56 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 28, 70, 16, 35, 73, 33, 81. Give your answer to 2 decimal places
Answer: Mean = 46.38, Median = 35, Range = 65