0.3
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It is: 3/10 expressed as a decimal is 0.3
Not sure what you mean by "express" form. But I assume you want the regular form. 4.009x10^-3 is 0.004009. Because 10^-3 means move the decimal to the left 3 digits.
2.7
13
Add a zero for ever power. 10 to the 1 is 10. 10 to the 2 is 100. 10 to the 3 is 1000...and so on.