1.405 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its rational equivalent is 1405/1000 which can be simplified. But simplification will mean that you lose information about the precision of the fraction.
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The answer will depend on what the fraction is.
blank = representation.
Write 107.17 as 107 17/100 as a fraction.
a power of 10
write 0.64 as a fraction