0.728 = (7 * 1/101) + (2 * 1/102) + (8 * 1/103)
0.728 = (7 * 1/10) + (2 * 1/100) + (8 * 1/1,000)
0.728 = 7/10 + 2/100 + 8/1,000
0.728 = 0.7 + 0.02 + 0.008
Expanded Form of 0.728
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