13.999 = (1 * 101) + (3 * 100) + (9 * 1/101) + (9 * 1/102) + (9 * 1/103)
13.999 = (1 * 10) + (3 * 1) + (9 * 1/10) + (9 * 1/100) + (9 * 1/1,000)
13.999 = 10 + 3 + 9/10 + 9/100 + 9/1,000
13.999 = 10 + 3 + 0.9 + 0.09 + 0.009
Expanded Form of 13.999
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