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take the whole number (3) and put it next to the fraction. Then put 0.4 as a fraction next to it, 0.4 is 4/10 which cancels to 2/5 (when you divide both numbers by 2)

So the answer is 3 and 2/5

For an improper fraction, now that we have 3 we simply write it as 5/5 & 5/5 &5/5 (as the denominator is the same as in the mixed number) 5+5+5=15, 15 add the 2 that is already ther is 17, so the answer is:

17/5 I don't know if it can be simplified.

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Q: How can you change 3.4 in an mixed number or a fraction?
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