Keystones — Capstone
Five GCSE retrieval questions · 29 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 + 5.8x
Answer: (x + 2.9)² - 8.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 28cm, angle = 77°
Answer: 272.8cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:3. Find a:b:c.
Answer: 8:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 33, 77, 49, 33, 60, 61, 73, 79
Answer: Mean = 62.1, Median = 61, Range = 61