Keystones — Capstone
Five GCSE retrieval questions · 17 August 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √432
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: 3x² + 30x + 4
Answer: 3(x + 5)² - 71 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 13cm, angle = 72°. Give your answer to 2 decimal places
Answer: 160.73cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 4:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 75, 47, 33, 73, 80, 97. Give your answer to 2 decimal places
Answer: Mean = 67.43, Median = 73, Range = 64