It is the representation in which the decimal number is represented by a sum consisting of each digit as a decimal number with one significant digit.
For example 12.345 = 10 + 2 + 0.3 + 0.04 + 0.005
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It is 0.3 in decimal form. There is no further expanded form.
It is already in decimal form. Expanded form: 0.6 + 0.03 + 0.004
3.221 is already in decimal. In expanded form it is 3+0.2+0.02+0.001
69.409 = 60 + 9 + 0.4 + 0.009 in expanded form
3.70917 = 3 + 0.7 + 0.009 + 0.0001 + 0.00007 (in expanded form)