Keystones — Capstone
Five GCSE retrieval questions · 4 November 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 5.6x
Answer: (x + 2.8)² - 7.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 30cm, angle = 53°
Answer: 299.5cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 3:4. Find a:b:c.
Answer: 9:12:16 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 42, 13, 62, 17, 18, 94
Answer: Mean = 43.1, Median = 42, Range = 81