Keystones — Capstone
Five GCSE retrieval questions · 11 May 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√275
Answer: 20√11 -
2. Algebra Completing the square
Complete the square: 5x² + 60x + 7
Answer: 5(x + 6)² - 173 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 22cm, angle = 80°. Give your answer to 2 decimal places
Answer: 216.66cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 32:20:5 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 25, 49, 18, 47, 30, 37, 60, 29. Give your answer to 2 decimal places
Answer: Mean = 43.11, Median = 37, Range = 75