Generally, we use expanded form when numbers have more than one digit to show how they're constructed. 0.6 has only one digit, so expanded form doesn't really apply.
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6/10 is 6 is six
4+0.6 Four and six tenths
6 tenths in expanded form
Expanded form is 20 + 4 = 24
4.6 = (4 x 1) + (6/10)