406.021 = (4 * 102) + (6 * 100) + (2 * 1/102) + (1 * 1/103)
406.021 = (4 * 100) + (6 * 1) + (2 * 1/100) + (1 * 1/1,000)
406.021 = 400 + 6 + 2/100 + 1/1,000
406.021 = 400 + 6 + 0.02 + 0.001
Expanded Form of 406.021
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