Expanded Form of 3.9

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Ones Tenths
3.9 3 . 9

Expanded Form of 3.9:
3.9 = (3 * 100) + (9 * 1/101)
3.9 = (3 * 1) + (9 * 1/10)
3.9 = 3 + 9/10

3.9 = 3 + 0.9

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