Keystones — Capstone
Five GCSE retrieval questions · 24 November 2022 · 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 + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 28cm, angle = 44°
Answer: 136.2cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c.
Answer: 16:12:18 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 92, 25, 30, 95, 16, 10, 91, 100
Answer: Mean = 57, Median = 54, Range = 90