4/1000 as a decimal is 0.004
4/10 as a decimal is 0.4
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It is 0.246It is 0.246
You write it as 0.004 because to the left of the decimal point is ones, to the first zero to the right of the decimal point is tenths, to the second zero to the right of the decimal point is hundredths, and so on.
407 thousandths = 0.407
6 and 4/10 = 6.4 as a decimal
4 9/10 (Four and nine-tenths) would be 4.9.