Keystones — Capstone
Five GCSE retrieval questions · 11 October 2021 · 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 + 4.6x
Answer: (x + 2.3)² - 5.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 20cm, angle = 41°
Answer: 78.7cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:5. Find a:b:c.
Answer: 8:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 11, 85, 100, 44, 36, 22, 69, 10
Answer: Mean = 50.7, Median = 44, Range = 90