0.4
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0.4 is already expressed in decimal form. It is equivalent to 4/10 or four tenths.
Four tenths =Fraction=4/10Decimal=0.4
6.4
The answer depends on the arithmetic operator between "eight" and four tenths".
The standard decimal form of fifteen and four tenths is 15.4. This is because the number 15 represents fifteen whole units, and the decimal point separates the whole number part from the decimal part, which is four tenths. So, when combined, it becomes 15.4 in standard decimal form.