10.21 = (1 * 101) + (2 * 1/101) + (1 * 1/102)
10.21 = (1 * 10) + (2 * 1/10) + (1 * 1/100)
10.21 = 10 + 2/10 + 1/100
10.21 = 10 + 0.2 + 0.01
Expanded Form of 10.21
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