Prime factors:
• 36 = 2² × 3²
• 54 = 2 × 3³
• 360 = 2³ × 3² × 5
Common prime factors are 2 × 3² = 18.
48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
64: 1, 2, 4, 8, 16, 32, 64
120: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120
The highest common factor (HCF) among these numbers is: 8
Factors of 20: 1, 2, 4, 5, 10, 20
Factors of 30: 1, 2, 3, 5, 10, 15, 30
Common factors: 1, 2, 5, 10
Highest common factor = 10
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