Keystones — Capstone
Five GCSE retrieval questions · 18 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: 5x² + 40x + 10
Answer: 5(x + 4)² - 70 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 12cm, angle = 65°. Give your answer to 2 decimal places
Answer: 97.88cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 5:30:18 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 67, 64, 19, 87, 90, 10, 82, 97. Give your answer to 2 decimal places
Answer: Mean = 58.56, Median = 67, Range = 87