1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 128, 160, 200, 256, 320, 400, 640, 800, 1280, 1600, 3200, 6400
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6400
6400
When rounding 6400 to the nearest ten, we look at the digit in the tens place, which is 4. Since 4 is less than 5, we round down. Therefore, 6400 rounded to the nearest ten is 6400.
6400
6400