Keystones — Capstone
Five GCSE retrieval questions · 26 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√18
Answer: 15√2 -
2. Algebra Completing the square
Complete the square: 3x² + 30x - 10
Answer: 3(x + 5)² - 85 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 27cm, angle = 79°. Give your answer to 2 decimal places
Answer: 344.55cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 15:6:8 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 87, 28, 24, 18, 26, 80, 14, 52. Give your answer to 2 decimal places
Answer: Mean = 47.33, Median = 28, Range = 83