Keystones — Capstone
Five GCSE retrieval questions · 24 August 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² + 3.6x
Answer: (x + 1.8)² - 3.24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 24cm, angle = 77°
Answer: 233.8cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:5. Find a:b:c.
Answer: 3:4:10 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 26, 23, 15, 86, 60, 27, 41, 95
Answer: Mean = 45.3, Median = 35, Range = 80