600,000,000+ 70,000,000+ 200,000+ 600+ 40
The expanded form of 670,200,640 is the sum of its place values: 600,000,000 + 70,000,000 + 200,000 + 6,000 + 40. By breaking it down, we understand the contribution of each digit based on its position. This helps to visualize the magnitude of each component of the number.
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